{"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","url":"https:\/\/www.rememberthefilter.com\/products\/koch-permanent-galvanized-steel-washable-filter","provider":"RememberTheFilter.com","version":"1.0","type":"link"}