{"title":"Koch Permanent Washable Metal Filters | Aluminum, Galvanized \u0026 Stainless","description":"\u003cp\u003eKoch permanent washable metal filters for installations where reusable filtration outweighs MERV efficiency — kitchen exhaust, grease applications, light-duty industrial intake, and any housing where filter changes are operationally difficult. \u003cstrong\u003eType MA aluminum mesh\u003c\/strong\u003e for general air and grease applications. \u003cstrong\u003eType MS galvanized steel\u003c\/strong\u003e for higher-temperature kitchen and light-industrial use. \u003cstrong\u003eStainless steel\u003c\/strong\u003e for wash-down environments, food service, and pharma where metal contamination is forbidden. All three constructions are washable, reusable, and engineered for indefinite service life with proper cleaning intervals. Pair with appropriate prefilter media for combined particulate + grease applications.\u003c\/p\u003e","products":[{"product_id":"koch-permanent-aluminum-washable-filter","title":"Koch Permanent Aluminum Washable Filter (Type MA, Air or Grease Applications)","description":"\u003cp\u003ePer Koch Bulletin \u003cstrong\u003eK985-A\u003c\/strong\u003e, the Koch \u003cstrong\u003ePermanent Aluminum Washable Filter\u003c\/strong\u003e is a \u003cstrong\u003ecompletely washable, reusable air filter\u003c\/strong\u003e designed for \u003cstrong\u003eair or grease applications\u003c\/strong\u003e. Per Koch K985-A, Type MA all-aluminum filters offer all the advantages of the standard metal filter \u003cstrong\u003ewith the added advantage of being extremely lightweight\u003c\/strong\u003e. The filters consist of \u003cstrong\u003ealuminum cloth secured by expanded aluminum mesh\u003c\/strong\u003e. Per Koch K985-A, \"this media has excellent dirt holding properties because of its large surface area.\" A durable all-aluminum frame encloses the media and provides longlasting support.\u003c\/p\u003e\u003ch3\u003eWhat you get: washable metal-frame filters, sold by the case\u003c\/h3\u003e\u003cp\u003eEach variant is a \u003cstrong\u003ecomplete metal-frame washable filter\u003c\/strong\u003e sized for standard HVAC and grease-application openings. Available in 1″ and 2″ depths, sold by the case in the carton quantities shown:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1″ depth filters:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e16″x20″x1″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16″x25″x1″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20″x20″x1″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20″x25″x1″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24″x24″x1″\u003c\/strong\u003e — \u003cem\u003eadditional size\u003c\/em\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ depth filters:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e16″x20″x2″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16″x25″x2″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20″x20″x2″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20″x25″x2″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24″x24″x2″\u003c\/strong\u003e — \u003cem\u003eadditional size\u003c\/em\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eCustom and additional sizes (such as 24″x24″ in 1″ and 2″ depths) are available beyond the K985-A published table. Per Koch K985-A, \"Please consult the factory for other sizes and configurations.\"\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eAbout the handles you see in product photos\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eThe pictured filter shows bail handles, but filters ship without handles by default.\u003c\/strong\u003e Per Koch K985-A: \"Filters are furnished without handles, but both bail and ring types are available upon request.\" If your application needs handles — for frequent removal in commercial kitchen exhaust hoods, equipment access panels, or any setting where the filter is pulled and washed often — \u003ca href=\"\/pages\/contact-us\"\u003econtact RTF support\u003c\/a\u003e before ordering and we'll arrange handles (bail or ring) on your case. Just let us know which handle type and how many filters need them.\u003c\/p\u003e\u003ch3\u003ePermanent Aluminum Filter construction (per Koch K985-A)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKoch product type:\u003c\/strong\u003e Type MA (Bulletin K985-A)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e Aluminum cloth secured by expanded aluminum mesh (per Koch K985-A)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame:\u003c\/strong\u003e Durable all-aluminum frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight advantage:\u003c\/strong\u003e Per Koch K985-A, \"extremely lightweight\" while retaining all advantages of standard metal filters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirt holding:\u003c\/strong\u003e Per Koch K985-A, \"excellent dirt holding properties because of its large surface area\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReusable:\u003c\/strong\u003e Completely washable (per Koch K985-A)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable depths:\u003c\/strong\u003e 1″ and 2″ (in this RTF lineup); 4″ depth available on request per Koch K985-A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHandles:\u003c\/strong\u003e Filters ship \u003cstrong\u003ewithout handles\u003c\/strong\u003e by default. Bail or ring handles available on request — see \"About the handles you see in product photos\" above, or \u003ca href=\"\/pages\/contact-us\"\u003econtact RTF support\u003c\/a\u003e before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoubled airflow option:\u003c\/strong\u003e Per Koch K985-A, \"Both steel and aluminum filters can be operated at twice the CFM capacities listed above, with corresponding increases in pressure drop.\" (Steel and aluminum specifically; consult Koch for stainless.)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/8″ and 3\/8″ depths:\u003c\/strong\u003e Available on request — \u003ca href=\"\/pages\/quote\"\u003erequest a quote\u003c\/a\u003e for these custom-thin variants.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePublished performance data (per Koch K985-A, Type MA)\u003c\/h3\u003e\u003cp\u003eThe following table reproduces Koch K985-A's published performance data for the Aluminum Permanent Filter line at the sizes carried in this RTF lineup:\u003c\/p\u003e\u003ctable style=\"border-collapse:collapse;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"border:1px solid #ccc;padding:8px;text-align:left;\"\u003eNominal Size\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;padding:8px;text-align:left;\"\u003eActual Size\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;padding:8px;text-align:left;\"\u003eRated CFM\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;padding:8px;text-align:left;\"\u003eInitial Resistance\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;padding:8px;text-align:left;\"\u003eAverage Arrestance\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e16″x20″x1″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e15.50  x  19.50  x  0.875″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e640\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.035″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e72%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e16″x25″x1″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e15.50  x  24.50  x  0.875″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e800\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.030″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e72%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e20″x20″x1″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e19.50  x  19.50  x  0.875″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e800\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.030″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e72%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e20″x25″x1″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e19.50  x  24.50  x  0.875″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e1000\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.030″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e72%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e16″x20″x2″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e15.50  x  19.50  x  1.75″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e640\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.050″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e72%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e16″x25″x2″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e15.50  x  24.50  x  1.75″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e800\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.050″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e72%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e20″x20″x2″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e19.50  x  19.50  x  1.75″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e800\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.050″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e72%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e20″x25″x2″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e19.50  x  24.50  x  1.75″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e1000\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.050″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e72%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cem\u003eAverage Arrestance is reported per ASHRAE 52.1 (older standard); these permanent metal filters are positioned as equipment protection and grease capture rather than fine particulate filtration.\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eCleaning and maintenance (per Koch K985-A)\u003c\/h3\u003e\u003cp\u003ePer Koch K985-A, the Permanent Metal Washable Filter is designed for in-service cleaning rather than disposal-and-replace. Koch's published maintenance procedure:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWash:\u003c\/strong\u003e Per Koch K985-A, \"Simply wash away dirt with hose or soapy water.\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRe-coat with adhesive:\u003c\/strong\u003e Per Koch K985-A, \"Recoat with adhesive spray before re-using.\"\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis permanent design is what gives metal filters their cost advantage over disposable filters — one filter, washed and recoated as needed, replaces many disposable filter changes over its service life.\u003c\/p\u003e\u003ch3\u003eAir or grease applications (per Koch K985-A)\u003c\/h3\u003e\u003cp\u003ePer Koch K985-A, Permanent Metal Washable Filters are specified for \u003cstrong\u003eboth air and grease applications\u003c\/strong\u003e. This dual-application capability reflects two main use cases:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHVAC air filtration:\u003c\/strong\u003e Equipment protection and primary particulate capture in commercial and residential HVAC systems where reusable filtration is preferred over disposable filters — especially in dusty environments where rapid loading would shorten disposable filter life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial kitchen exhaust:\u003c\/strong\u003e Range hoods, grill hoods, and other foodservice exhaust applications where grease-laden vapor must be filtered before exhaust ductwork. The metal frame and washable construction handle the high-temperature, grease-saturated airstream that would destroy fiber-based filters. Required in many jurisdictions for foodservice fire-safety compliance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAbout permanent metal washable filters\u003c\/h3\u003e\u003cp\u003ePermanent metal filters trade off particulate efficiency (the average arrestance values are in the 71–76% range per Koch K985-A) for two critical advantages over disposable filters: \u003cstrong\u003ereusability\u003c\/strong\u003e (washable cycles instead of replacement) and \u003cstrong\u003egrease\/temperature tolerance\u003c\/strong\u003e (metal mesh stands up to grease and heat that would saturate or melt fiber media). For applications where fine particulate filtration is the goal — office HVAC, sensitive equipment, indoor air quality — you'll want a higher-efficiency disposable pleated filter (MERV 8+) instead. For equipment protection, primary capture, kitchen exhaust, and any setting where filter changes need to be infrequent, permanent metal filters are the right specification.\u003c\/p\u003e\u003ch3\u003eSizing and ordering notes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatch nominal size to your filter slot.\u003c\/strong\u003e Per Koch K985-A, actual size for 1″ nominal-depth filters is 0.875″ (7\/8″) deep, and actual size for 2″ nominal-depth filters is 1.75″ (1-3\/4″) deep.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEach variant ships in the case quantity shown.\u003c\/strong\u003e Order multiple cases by adjusting the quantity at checkout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom thin filters:\u003c\/strong\u003e 1\/8″ and 3\/8″ depths are available on request from Koch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeed handles?\u003c\/strong\u003e Filters ship without handles by default. Bail or ring handles available on request — \u003ca href=\"\/pages\/contact-us\"\u003econtact RTF support\u003c\/a\u003e before placing your order so we can arrange handles on your case.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor grease\/kitchen applications:\u003c\/strong\u003e Replace or wash on your maintenance schedule per local fire code requirements (typically 30 days for active foodservice).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCleaning:\u003c\/strong\u003e Per Koch K985-A, hose or soapy water; recoat with adhesive spray before re-using.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eKoch product literature\u003c\/h3\u003e\u003cp\u003eDetailed product specifications and complete performance data for Koch Permanent Metal Washable Filters (Type MS galvanized steel and Type MA aluminum) are published in \u003cstrong\u003eKoch Bulletin K985-A\u003c\/strong\u003e: \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/PermanentMetalFrames.pdf\" target=\"_blank\" rel=\"noopener\"\u003ePermanent Metal Washable Filters Product Specification PDF\u003c\/a\u003e (Koch Filter Corporation).\u003c\/p\u003e","brand":"Koch","offers":[{"title":"16\"x20\"x1\" (Case of 12)","offer_id":44119111827578,"sku":"118-616-154-194","price":482.28,"currency_code":"USD","in_stock":true},{"title":"16\"x25\"x1\" (Case of 12)","offer_id":44119111860346,"sku":"118-616-154-244","price":541.08,"currency_code":"USD","in_stock":true},{"title":"20\"x20\"x1\" (Case of 12)","offer_id":44119111893114,"sku":"118-616-194-194","price":559.2,"currency_code":"USD","in_stock":true},{"title":"20\"x25\"x1\" (Case of 12)","offer_id":44119111925882,"sku":"118-616-194-244","price":600.72,"currency_code":"USD","in_stock":true},{"title":"24\"x24\"x1\" (Case of 12)","offer_id":44119111958650,"sku":"118-616-234-234","price":663.36,"currency_code":"USD","in_stock":true},{"title":"16\"x20\"x2\" (Case of 12)","offer_id":44119111991418,"sku":"118-618-154-194","price":561.96,"currency_code":"USD","in_stock":true},{"title":"16\"x25\"x2\" (Case of 12)","offer_id":44119112024186,"sku":"118-618-154-244","price":589.08,"currency_code":"USD","in_stock":true},{"title":"20\"x20\"x2\" (Case of 12)","offer_id":44119112056954,"sku":"118-618-194-194","price":589.08,"currency_code":"USD","in_stock":true},{"title":"20\"x25\"x2\" (Case of 12)","offer_id":44119112089722,"sku":"118-618-194-244","price":730.8,"currency_code":"USD","in_stock":true},{"title":"24\"x24\"x2\" (Case of 12)","offer_id":44119112122490,"sku":"118-618-234-234","price":759.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/getimage2_fc371ff6-88fe-435d-9e1a-113b5b005276.jpg?v=1777841601"},{"product_id":"koch-permanent-galvanized-steel-washable-filter","title":"Koch Permanent Galvanized Steel Washable Filter (Type MS, Air or Grease Applications)","description":"\u003cp\u003ePer Koch Bulletin \u003cstrong\u003eK985-A\u003c\/strong\u003e, the Koch \u003cstrong\u003ePermanent Galvanized Steel Washable Filter\u003c\/strong\u003e is a \u003cstrong\u003ecompletely washable, reusable air filter\u003c\/strong\u003e designed for \u003cstrong\u003eair or grease applications\u003c\/strong\u003e. Per Koch K985-A, Type MS all-steel filters are designed for a wide range of uses and can be operated at \u003cstrong\u003e300-600 FPM\u003c\/strong\u003e. The media consists of \u003cstrong\u003ecrimped wire and expanded metal cloth\u003c\/strong\u003e, which Koch K985-A states \"provides superior dust catching ability and a life cycle up to four times longer than conventional filters.\" This media is enclosed in a durable metal frame.\u003c\/p\u003e\u003ch3\u003eWhat you get: washable metal-frame filters, sold by the case\u003c\/h3\u003e\u003cp\u003eEach variant is a \u003cstrong\u003ecomplete metal-frame washable filter\u003c\/strong\u003e sized for standard HVAC and grease-application openings. Available in 1″ and 2″ depths, sold by the case in the carton quantities shown:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1″ depth filters:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e16″x20″x1″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16″x25″x1″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20″x20″x1″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20″x25″x1″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24″x24″x1″\u003c\/strong\u003e — \u003cem\u003eadditional size\u003c\/em\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ depth filters:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e16″x20″x2″\u003c\/strong\u003e — \u003cstrong\u003e6 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16″x25″x2″\u003c\/strong\u003e — \u003cstrong\u003e6 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20″x20″x2″\u003c\/strong\u003e — \u003cstrong\u003e6 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20″x25″x2″\u003c\/strong\u003e — \u003cstrong\u003e6 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24″x24″x2″\u003c\/strong\u003e — \u003cem\u003eadditional size\u003c\/em\u003e — \u003cstrong\u003e6 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eCustom and additional sizes (such as 24″x24″ in 1″ and 2″ depths) are available beyond the K985-A published table. Per Koch K985-A, \"Please consult the factory for other sizes and configurations.\"\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eAbout the handles you see in product photos\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eThe pictured filter shows bail handles, but filters ship without handles by default.\u003c\/strong\u003e Per Koch K985-A: \"Filters are furnished without handles, but both bail and ring types are available upon request.\" If your application needs handles — for frequent removal in commercial kitchen exhaust hoods, equipment access panels, or any setting where the filter is pulled and washed often — \u003ca href=\"\/pages\/contact-us\"\u003econtact RTF support\u003c\/a\u003e before ordering and we'll arrange handles (bail or ring) on your case. Just let us know which handle type and how many filters need them.\u003c\/p\u003e\u003ch3\u003ePermanent Galvanized Steel Filter construction (per Koch K985-A)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Galvanized Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKoch product type:\u003c\/strong\u003e Type MS (Bulletin K985-A)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e Crimped wire and expanded metal cloth (per Koch K985-A)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame:\u003c\/strong\u003e Durable galvanized steel frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating range:\u003c\/strong\u003e 300-600 FPM (per Koch K985-A)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService life:\u003c\/strong\u003e Per Koch K985-A, \"life cycle up to four times longer than conventional filters\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReusable:\u003c\/strong\u003e Completely washable (per Koch K985-A)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable depths:\u003c\/strong\u003e 1″ and 2″ (in this RTF lineup); 4″ depth available on request per Koch K985-A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHandles:\u003c\/strong\u003e Filters ship \u003cstrong\u003ewithout handles\u003c\/strong\u003e by default. Bail or ring handles available on request — see \"About the handles you see in product photos\" above, or \u003ca href=\"\/pages\/contact-us\"\u003econtact RTF support\u003c\/a\u003e before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoubled airflow option:\u003c\/strong\u003e Per Koch K985-A, \"Both steel and aluminum filters can be operated at twice the CFM capacities listed above, with corresponding increases in pressure drop.\" (Steel and aluminum specifically; consult Koch for stainless.)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/8″ and 3\/8″ depths:\u003c\/strong\u003e Available on request — \u003ca href=\"\/pages\/quote\"\u003erequest a quote\u003c\/a\u003e for these custom-thin variants.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePublished performance data (per Koch K985-A, Type MS)\u003c\/h3\u003e\u003cp\u003eThe following table reproduces Koch K985-A's published performance data for the Galvanized Steel Permanent Filter line at the sizes carried in this RTF lineup:\u003c\/p\u003e\u003ctable style=\"border-collapse:collapse;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"border:1px solid #ccc;padding:8px;text-align:left;\"\u003eNominal Size\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;padding:8px;text-align:left;\"\u003eActual Size\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;padding:8px;text-align:left;\"\u003eRated CFM\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;padding:8px;text-align:left;\"\u003eInitial Resistance\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;padding:8px;text-align:left;\"\u003eAverage Arrestance\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e16″x20″x1″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e15.50  x  19.50  x  0.875″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e640\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.050″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e71%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e16″x25″x1″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e15.50  x  24.50  x  0.875″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e800\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.050″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e71%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e20″x20″x1″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e19.50  x  19.50  x  0.875″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e800\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.050″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e71%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e20″x25″x1″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e19.50  x  24.50  x  0.875″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e1000\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.050″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e71%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e16″x20″x2″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e15.50  x  19.50  x  1.75″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e640\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.100″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e76%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e16″x25″x2″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e15.50  x  24.50  x  1.75″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e800\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.100″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e76%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e20″x20″x2″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e19.50  x  19.50  x  1.75″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e800\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.100″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e76%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e\u003cstrong\u003e20″x25″x2″\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e19.50  x  24.50  x  1.75″\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e1000\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e0.100″ w.g.\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:8px;\"\u003e76%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cem\u003eAverage Arrestance is reported per ASHRAE 52.1 (older standard); these permanent metal filters are positioned as equipment protection and grease capture rather than fine particulate filtration.\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eCleaning and maintenance (per Koch K985-A)\u003c\/h3\u003e\u003cp\u003ePer Koch K985-A, the Permanent Metal Washable Filter is designed for in-service cleaning rather than disposal-and-replace. Koch's published maintenance procedure:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWash:\u003c\/strong\u003e Per Koch K985-A, \"Simply wash away dirt with hose or soapy water.\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRe-coat with adhesive:\u003c\/strong\u003e Per Koch K985-A, \"Recoat with adhesive spray before re-using.\"\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis permanent design is what gives metal filters their cost advantage over disposable filters — one filter, washed and recoated as needed, replaces many disposable filter changes over its service life.\u003c\/p\u003e\u003ch3\u003eAir or grease applications (per Koch K985-A)\u003c\/h3\u003e\u003cp\u003ePer Koch K985-A, Permanent Metal Washable Filters are specified for \u003cstrong\u003eboth air and grease applications\u003c\/strong\u003e. This dual-application capability reflects two main use cases:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHVAC air filtration:\u003c\/strong\u003e Equipment protection and primary particulate capture in commercial and residential HVAC systems where reusable filtration is preferred over disposable filters — especially in dusty environments where rapid loading would shorten disposable filter life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial kitchen exhaust:\u003c\/strong\u003e Range hoods, grill hoods, and other foodservice exhaust applications where grease-laden vapor must be filtered before exhaust ductwork. The metal frame and washable construction handle the high-temperature, grease-saturated airstream that would destroy fiber-based filters. Required in many jurisdictions for foodservice fire-safety compliance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAbout permanent metal washable filters\u003c\/h3\u003e\u003cp\u003ePermanent metal filters trade off particulate efficiency (the average arrestance values are in the 71–76% range per Koch K985-A) for two critical advantages over disposable filters: \u003cstrong\u003ereusability\u003c\/strong\u003e (washable cycles instead of replacement) and \u003cstrong\u003egrease\/temperature tolerance\u003c\/strong\u003e (metal mesh stands up to grease and heat that would saturate or melt fiber media). For applications where fine particulate filtration is the goal — office HVAC, sensitive equipment, indoor air quality — you'll want a higher-efficiency disposable pleated filter (MERV 8+) instead. For equipment protection, primary capture, kitchen exhaust, and any setting where filter changes need to be infrequent, permanent metal filters are the right specification.\u003c\/p\u003e\u003ch3\u003eSizing and ordering notes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatch nominal size to your filter slot.\u003c\/strong\u003e Per Koch K985-A, actual size for 1″ nominal-depth filters is 0.875″ (7\/8″) deep, and actual size for 2″ nominal-depth filters is 1.75″ (1-3\/4″) deep.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEach variant ships in the case quantity shown.\u003c\/strong\u003e Order multiple cases by adjusting the quantity at checkout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom thin filters:\u003c\/strong\u003e 1\/8″ and 3\/8″ depths are available on request from Koch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeed handles?\u003c\/strong\u003e Filters ship without handles by default. Bail or ring handles available on request — \u003ca href=\"\/pages\/contact-us\"\u003econtact RTF support\u003c\/a\u003e before placing your order so we can arrange handles on your case.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor grease\/kitchen applications:\u003c\/strong\u003e Replace or wash on your maintenance schedule per local fire code requirements (typically 30 days for active foodservice).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCleaning:\u003c\/strong\u003e Per Koch K985-A, hose or soapy water; recoat with adhesive spray before re-using.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eKoch product literature\u003c\/h3\u003e\u003cp\u003eDetailed product specifications and complete performance data for Koch Permanent Metal Washable Filters (Type MS galvanized steel and Type MA aluminum) are published in \u003cstrong\u003eKoch Bulletin K985-A\u003c\/strong\u003e: \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/PermanentMetalFrames.pdf\" target=\"_blank\" rel=\"noopener\"\u003ePermanent Metal Washable Filters Product Specification PDF\u003c\/a\u003e (Koch Filter Corporation).\u003c\/p\u003e","brand":"Koch","offers":[{"title":"16\"x20\"x1\" (Case of 12)","offer_id":44119112155258,"sku":"118-606-154-194","price":482.28,"currency_code":"USD","in_stock":true},{"title":"16\"x25\"x1\" (Case of 12)","offer_id":44119112188026,"sku":"118-606-154-244","price":541.08,"currency_code":"USD","in_stock":true},{"title":"20\"x20\"x1\" (Case of 12)","offer_id":44119112220794,"sku":"118-606-194-194","price":532.56,"currency_code":"USD","in_stock":true},{"title":"20\"x25\"x1\" (Case of 12)","offer_id":44119112253562,"sku":"118-606-194-244","price":572.04,"currency_code":"USD","in_stock":true},{"title":"24\"x24\"x1\" (Case of 12)","offer_id":44119112286330,"sku":"118-606-234-234","price":663.36,"currency_code":"USD","in_stock":true},{"title":"16\"x20\"x2\" (Case of 6)","offer_id":44119112319098,"sku":"118-608-154-194","price":280.98,"currency_code":"USD","in_stock":true},{"title":"16\"x25\"x2\" (Case of 6)","offer_id":44119112351866,"sku":"118-608-154-244","price":337.08,"currency_code":"USD","in_stock":true},{"title":"20\"x20\"x2\" (Case of 6)","offer_id":44119112384634,"sku":"118-608-194-194","price":318.54,"currency_code":"USD","in_stock":true},{"title":"20\"x25\"x2\" (Case of 6)","offer_id":44119112417402,"sku":"118-608-194-244","price":381.48,"currency_code":"USD","in_stock":true},{"title":"24\"x24\"x2\" (Case of 6)","offer_id":44119112450170,"sku":"118-608-234-234","price":408.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/getimage2_33127f1b-3299-4a95-a56b-7fc70bc81e37.jpg?v=1777841593"},{"product_id":"koch-permanent-stainless-steel-washable-filter","title":"Koch Permanent Stainless Steel Washable Filter (Air or Grease Applications)","description":"\u003cp\u003ePer Koch Bulletin \u003cstrong\u003eK985-A\u003c\/strong\u003e, the Koch \u003cstrong\u003ePermanent Stainless Steel Washable Filter\u003c\/strong\u003e is a \u003cstrong\u003ecompletely washable, reusable air filter\u003c\/strong\u003e designed for \u003cstrong\u003eair or grease applications\u003c\/strong\u003e. Stainless Steel construction is the premium material option in the Koch Permanent Metal Filter product line, providing the corrosion resistance and durability needed for high-moisture, high-temperature, or chemically demanding environments. Stainless construction is available as a custom material option from Koch — per Koch product literature, \u003cem\u003e\"Please consult the factory for specific size and configuration data.\"\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eWhat you get: washable metal-frame filters, sold by the case\u003c\/h3\u003e\u003cp\u003eEach variant is a \u003cstrong\u003ecomplete metal-frame washable filter\u003c\/strong\u003e sized for standard HVAC and grease-application openings. Available in 1″ and 2″ depths, sold by the case in the carton quantities shown:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1″ depth filters:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e16″x20″x1″\u003c\/strong\u003e — available by quote. \u003ca href=\"\/pages\/quote\"\u003eRequest a quote\u003c\/a\u003e for current pricing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16″x25″x1″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20″x20″x1″\u003c\/strong\u003e — available by quote. \u003ca href=\"\/pages\/quote\"\u003eRequest a quote\u003c\/a\u003e for current pricing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20″x25″x1″\u003c\/strong\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24″x24″x1″\u003c\/strong\u003e — \u003cem\u003eadditional size\u003c\/em\u003e — \u003cstrong\u003e12 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ depth filters:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e16″x20″x2″\u003c\/strong\u003e — \u003cstrong\u003e6 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16″x25″x2″\u003c\/strong\u003e — \u003cstrong\u003e6 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20″x20″x2″\u003c\/strong\u003e — available by quote. \u003ca href=\"\/pages\/quote\"\u003eRequest a quote\u003c\/a\u003e for current pricing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20″x25″x2″\u003c\/strong\u003e — \u003cstrong\u003e6 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24″x24″x2″\u003c\/strong\u003e — \u003cem\u003eadditional size\u003c\/em\u003e — \u003cstrong\u003e6 filters per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAbout the handles you see in product photos\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eThe pictured filter shows bail handles, but filters ship without handles by default.\u003c\/strong\u003e Per Koch K985-A: \"Filters are furnished without handles, but both bail and ring types are available upon request.\" If your application needs handles — for frequent removal in commercial kitchen exhaust hoods, equipment access panels, or any setting where the filter is pulled and washed often — \u003ca href=\"\/pages\/contact-us\"\u003econtact RTF support\u003c\/a\u003e before ordering and we'll arrange handles (bail or ring) on your case. Just let us know which handle type and how many filters need them.\u003c\/p\u003e\u003ch3\u003ePermanent Stainless Steel Filter construction (per Koch K985-A)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e Stainless steel mesh construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame:\u003c\/strong\u003e All-stainless-steel frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse case:\u003c\/strong\u003e Premium-tier washable filter for environments where corrosion resistance, high temperatures, or chemical exposure rule out steel or aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReusable:\u003c\/strong\u003e Completely washable (per Koch K985-A)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable depths:\u003c\/strong\u003e 1″ and 2″ (in this RTF lineup); 4″ depth available on request per Koch K985-A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHandles:\u003c\/strong\u003e Filters ship \u003cstrong\u003ewithout handles\u003c\/strong\u003e by default. Bail or ring handles available on request — see \"About the handles you see in product photos\" above, or \u003ca href=\"\/pages\/contact-us\"\u003econtact RTF support\u003c\/a\u003e before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoubled airflow option:\u003c\/strong\u003e Per Koch K985-A, \"Both steel and aluminum filters can be operated at twice the CFM capacities listed above, with corresponding increases in pressure drop.\" (Steel and aluminum specifically; consult Koch for stainless.)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/8″ and 3\/8″ depths:\u003c\/strong\u003e Available on request — \u003ca href=\"\/pages\/quote\"\u003erequest a quote\u003c\/a\u003e for these custom-thin variants.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCleaning and maintenance (per Koch K985-A)\u003c\/h3\u003e\u003cp\u003ePer Koch K985-A, the Permanent Metal Washable Filter is designed for in-service cleaning rather than disposal-and-replace. Koch's published maintenance procedure:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWash:\u003c\/strong\u003e Per Koch K985-A, \"Simply wash away dirt with hose or soapy water.\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRe-coat with adhesive:\u003c\/strong\u003e Per Koch K985-A, \"Recoat with adhesive spray before re-using.\"\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis permanent design is what gives metal filters their cost advantage over disposable filters — one filter, washed and recoated as needed, replaces many disposable filter changes over its service life.\u003c\/p\u003e\u003ch3\u003eAir or grease applications (per Koch K985-A)\u003c\/h3\u003e\u003cp\u003ePer Koch K985-A, Permanent Metal Washable Filters are specified for \u003cstrong\u003eboth air and grease applications\u003c\/strong\u003e. This dual-application capability reflects two main use cases:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHVAC air filtration:\u003c\/strong\u003e Equipment protection and primary particulate capture in commercial and residential HVAC systems where reusable filtration is preferred over disposable filters — especially in dusty environments where rapid loading would shorten disposable filter life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial kitchen exhaust:\u003c\/strong\u003e Range hoods, grill hoods, and other foodservice exhaust applications where grease-laden vapor must be filtered before exhaust ductwork. The metal frame and washable construction handle the high-temperature, grease-saturated airstream that would destroy fiber-based filters. Required in many jurisdictions for foodservice fire-safety compliance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAbout permanent metal washable filters\u003c\/h3\u003e\u003cp\u003ePermanent metal filters as a category trade off particulate efficiency (typical average arrestance for steel and aluminum constructions is in the low- to mid-70% range per Koch K985-A; stainless arrestance varies by mesh specification, contact Koch for spec data) for two critical advantages over disposable filters: \u003cstrong\u003ereusability\u003c\/strong\u003e (washable cycles instead of replacement) and \u003cstrong\u003egrease\/temperature tolerance\u003c\/strong\u003e (metal mesh stands up to grease and heat that would saturate or melt fiber media). For applications where fine particulate filtration is the goal — office HVAC, sensitive equipment, indoor air quality — you'll want a higher-efficiency disposable pleated filter (MERV 8+) instead. For equipment protection, primary capture, kitchen exhaust, and any setting where filter changes need to be infrequent, permanent metal filters are the right specification.\u003c\/p\u003e\u003ch3\u003eSizing and ordering notes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatch nominal size to your filter slot.\u003c\/strong\u003e Actual depth is slightly less than nominal (typical pattern: 1″ nominal = ~7\/8″ actual; 2″ nominal = ~1-3\/4″ actual).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEach variant ships in the case quantity shown.\u003c\/strong\u003e Order multiple cases by adjusting the quantity at checkout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom thin filters:\u003c\/strong\u003e 1\/8″ and 3\/8″ depths are available on request from Koch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeed handles?\u003c\/strong\u003e Filters ship without handles by default. Bail or ring handles available on request — \u003ca href=\"\/pages\/contact-us\"\u003econtact RTF support\u003c\/a\u003e before placing your order so we can arrange handles on your case.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor grease\/kitchen applications:\u003c\/strong\u003e Replace or wash on your maintenance schedule per local fire code requirements (typically 30 days for active foodservice).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCleaning:\u003c\/strong\u003e Per Koch K985-A, hose or soapy water; recoat with adhesive spray before re-using.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eKoch product literature\u003c\/h3\u003e\u003cp\u003eDetailed product specifications and complete performance data for Koch Permanent Metal Washable Filters (Type MS galvanized steel and Type MA aluminum) are published in \u003cstrong\u003eKoch Bulletin K985-A\u003c\/strong\u003e: \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/PermanentMetalFrames.pdf\" target=\"_blank\" rel=\"noopener\"\u003ePermanent Metal Washable Filters Product Specification PDF\u003c\/a\u003e (Koch Filter Corporation). Stainless steel construction is available as a custom material option (Koch K985-A documents Type MS and Type MA only). Contact Koch Filter Corporation or RTF for stainless-specific spec data.\u003c\/p\u003e","brand":"Koch","offers":[{"title":"16\"x20\"x1\" (Call for Quote)","offer_id":44119112482938,"sku":"118-626-154-194","price":0.0,"currency_code":"USD","in_stock":false},{"title":"16\"x25\"x1\" (Case of 12)","offer_id":44119112515706,"sku":"118-626-154-244","price":3171.84,"currency_code":"USD","in_stock":true},{"title":"20\"x20\"x1\" (Call for Quote)","offer_id":44119112548474,"sku":"118-626-194-194","price":0.0,"currency_code":"USD","in_stock":false},{"title":"20\"x25\"x1\" (Case of 12)","offer_id":44119112581242,"sku":"118-626-194-244","price":3473.76,"currency_code":"USD","in_stock":true},{"title":"24\"x24\"x1\" (Case of 12)","offer_id":44119112614010,"sku":"118-626-234-234","price":3568.8,"currency_code":"USD","in_stock":true},{"title":"16\"x20\"x2\" (Case of 6)","offer_id":44119112646778,"sku":"118-628-154-194","price":1501.44,"currency_code":"USD","in_stock":true},{"title":"16\"x25\"x2\" (Case of 6)","offer_id":44119112679546,"sku":"118-628-154-244","price":1625.76,"currency_code":"USD","in_stock":true},{"title":"20\"x20\"x2\" (Call for Quote)","offer_id":44119112712314,"sku":"118-628-194-194","price":0.0,"currency_code":"USD","in_stock":false},{"title":"20\"x25\"x2\" (Case of 6)","offer_id":44119112745082,"sku":"118-628-194-244","price":1736.88,"currency_code":"USD","in_stock":true},{"title":"24\"x24\"x2\" (Case of 6)","offer_id":44119112777850,"sku":"118-628-234-234","price":1869.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/getimage2_7ba63dba-b719-4a78-b21b-c4dd2a17318c.jpg?v=1777841604"}],"url":"https:\/\/www.rememberthefilter.com\/collections\/koch-permanent-washable.oembed","provider":"RememberTheFilter.com","version":"1.0","type":"link"}