{"product_id":"koch-duo-cap-cartridge-filter","title":"Koch Duo-Cap MERV 8 Extended Surface Cartridge Filter for Cambridge Hi-Cap \u0026 Side-Cap Frames","description":"\u003cp\u003eKoch \u003cstrong\u003eDuo-Cap Filter Cartridges\u003c\/strong\u003e are extended-surface synthetic cartridge filters engineered as a \u003cstrong\u003edrop-in replacement for Cambridge Filter Corporation Hi-Cap and Side-Cap frame systems\u003c\/strong\u003e. Same nominal dimensions, same install footprint — fits Cambridge frames without any modification to existing framework. Both 1-Ply and 2-Ply ply tiers carry a \u003cstrong\u003eMERV 8 efficiency rating\u003c\/strong\u003e per ASHRAE 52.2; the difference is in dust holding capacity and service life.\u003c\/p\u003e\u003ch3\u003eCambridge Hi-Cap and Side-Cap replacement\u003c\/h3\u003e\u003cp\u003eIf your facility uses \u003cstrong\u003eCambridge Filter Corporation Hi-Cap or Side-Cap frame systems\u003c\/strong\u003e, the Duo-Cap is a direct sourcing option. Koch engineered the Duo-Cap to drop into existing Cambridge framework without any housing modification — same nominal sizes, same cartridge geometry. This protects facilities from supply-chain disruption when Cambridge cartridges become hard to source or quote, and it gives maintenance teams an alternative supplier for ongoing changeouts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrame and brackets are NOT included.\u003c\/strong\u003e The Duo-Cap is a replacement cartridge for existing frames — if you need new frames or brackets, those are sourced separately.\u003c\/p\u003e\u003ch3\u003eWhat an extended-surface cartridge filter is\u003c\/h3\u003e\u003cp\u003eExtended-surface cartridge filters pack the synthetic media into a deep three-dimensional cartridge geometry that increases the effective filtering surface area dramatically compared to a flat panel filter of the same face dimensions. The result is \u003cstrong\u003elonger service life\u003c\/strong\u003e, \u003cstrong\u003elower pressure drop at equivalent capture\u003c\/strong\u003e, and substantially better dust holding capacity. Cartridge filters drop into Cambridge Hi-Cap or Side-Cap frame assemblies that are already installed in commercial AHUs, packaged rooftop units, and industrial air handlers.\u003c\/p\u003e\u003ch3\u003e1-Ply vs. 2-Ply — choosing the right tier\u003c\/h3\u003e\u003cp\u003eBoth Duo-Cap tiers share the same \u003cstrong\u003eMERV 8 efficiency rating\u003c\/strong\u003e and the same Cambridge-compatible cartridge geometry. The differences are in media construction, dust holding capacity, and price:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuo-Cap 1-Ply (Standard):\u003c\/strong\u003e Single-layer polyester media. The \u003cstrong\u003eeconomical configuration\u003c\/strong\u003e — most cost-effective per filter, lowest pressure drop. The right pick for primary filter applications where MERV 8 capture meets the spec and changeout intervals are reasonable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuo-Cap 2-Ply (High-Capacity):\u003c\/strong\u003e Two layers of progressively dense polyester media. \u003cstrong\u003eHigher dust holding capacity\u003c\/strong\u003e for longer changeout intervals and better performance under heavy dust loading. Specify 2-Ply when total cost-per-changeout matters more than per-filter cost, when the airstream carries heavier dust loading, or when access for changeouts is difficult and longer service life is valuable.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDesign and construction\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Extended-surface cartridge filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e Progressively dense synthetic polyester (graded density). Microfiberglass available upon request — \u003ca href=\"\/pages\/quote\"\u003erequest a quote\u003c\/a\u003e for fiberglass media.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame compatibility:\u003c\/strong\u003e Cambridge Filter Corporation Hi-Cap and Side-Cap frame systems (drop-in, no modification required). Frames and brackets sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficiency rating:\u003c\/strong\u003e MERV 8 per ASHRAE Test Standard 52.2-2012\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference bulletin:\u003c\/strong\u003e Koch K-240\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by the case.\u003c\/strong\u003e Carton quantity varies by depth and face size: 9″-depth cartridges typically ship 10 per case (24x24x9 ships 5 per case for 2-Ply); 15″-depth cartridges typically ship 5 per case (12x24x15 ships 10 per case). The variant price is the case price.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhen the Duo-Cap is specified\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCambridge Hi-Cap and Side-Cap frame replacement\u003c\/strong\u003e — the primary use case for this product\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinal filter stages\u003c\/strong\u003e in commercial AHUs and industrial HVAC where Cambridge cartridge frames are installed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard commercial HVAC final filtration\u003c\/strong\u003e — office buildings, schools, retail, hospitality, healthcare where MERV 8 is the design target\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-stage filtration systems\u003c\/strong\u003e behind a panel prefilter — the cartridge geometry extends service life dramatically over flat panels\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial facilities\u003c\/strong\u003e — manufacturing, warehousing, process environments needing MERV 8 cartridge format\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy dust loading installations\u003c\/strong\u003e — specify 2-Ply for the higher dust holding capacity\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat MERV 8 captures\u003c\/h3\u003e\u003cp\u003eMERV 8 captures dust mite debris, pollen, mold spores, pet dander, and most household and office airborne dust. The standard high-efficiency target for commercial buildings and high-IAQ commercial applications, balancing capture performance with airflow.\u003c\/p\u003e\u003ch3\u003eSizing and ordering notes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecify both face dimensions and depth.\u003c\/strong\u003e Cartridges are sized as Width x Height x Depth (e.g., 24x24x15). Match all three dimensions to your Cambridge frame — cartridges cannot be cut or trimmed in the field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrames sold separately.\u003c\/strong\u003e The Duo-Cap is a replacement cartridge only. If you need new frames or brackets, contact us for the Cambridge or compatible frame products.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicrofiberglass media available on request.\u003c\/strong\u003e Standard Duo-Cap is synthetic polyester. For applications requiring microfiberglass media, \u003ca href=\"\/pages\/quote\"\u003erequest a quote\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\"Call for Quote\" sizes:\u003c\/strong\u003e Some sizes are catalog items but require direct quoting due to lower order volume or build-to-order production. These appear unavailable in the dropdown — \u003ca href=\"\/pages\/quote\"\u003erequest a quote\u003c\/a\u003e for these sizes or for facility-scale orders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeed a different filter form factor?\u003c\/strong\u003e See the Koch Duo-Cube line (cube filters in cube baskets) or the Duo-Pak 40 line (two-pocket filters in holding frames) for alternatives.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Koch","offers":[{"title":"1-Ply (economical, polyester) \/ 16x20x9","offer_id":44118928359546,"sku":"103-700-002","price":0.0,"currency_code":"USD","in_stock":false},{"title":"1-Ply (economical, polyester) \/ 16x25x9","offer_id":44118928392314,"sku":"103-700-003","price":0.0,"currency_code":"USD","in_stock":false},{"title":"1-Ply (economical, polyester) \/ 20x20x9","offer_id":44118928425082,"sku":"103-700-004","price":240.2,"currency_code":"USD","in_stock":true},{"title":"1-Ply (economical, polyester) \/ 20x24x9","offer_id":44118928457850,"sku":"103-700-005","price":242.5,"currency_code":"USD","in_stock":true},{"title":"1-Ply (economical, polyester) \/ 20x25x9","offer_id":44118928490618,"sku":"103-700-006","price":289.4,"currency_code":"USD","in_stock":true},{"title":"1-Ply (economical, polyester) \/ 24x24x9","offer_id":44118928523386,"sku":"103-700-007","price":259.0,"currency_code":"USD","in_stock":true},{"title":"1-Ply (economical, polyester) \/ 12x24x15","offer_id":44118928556154,"sku":"103-700-008","price":254.6,"currency_code":"USD","in_stock":true},{"title":"1-Ply (economical, polyester) \/ 16x20x15","offer_id":44118928588922,"sku":"103-700-009","price":0.0,"currency_code":"USD","in_stock":false},{"title":"1-Ply (economical, polyester) \/ 16x25x15","offer_id":44118928621690,"sku":"103-700-010","price":0.0,"currency_code":"USD","in_stock":false},{"title":"1-Ply (economical, polyester) \/ 20x20x15","offer_id":44118928654458,"sku":"103-700-011","price":348.0,"currency_code":"USD","in_stock":true},{"title":"1-Ply (economical, polyester) \/ 20x24x15","offer_id":44118928687226,"sku":"103-700-012","price":174.0,"currency_code":"USD","in_stock":true},{"title":"1-Ply (economical, polyester) \/ 20x25x15","offer_id":44118928719994,"sku":"103-700-013","price":0.0,"currency_code":"USD","in_stock":false},{"title":"1-Ply (economical, polyester) \/ 24x24x15","offer_id":44118928752762,"sku":"103-700-014","price":202.5,"currency_code":"USD","in_stock":true},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 12x24x9","offer_id":44118928785530,"sku":"103-701-001","price":337.3,"currency_code":"USD","in_stock":true},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 16x20x9","offer_id":44118928818298,"sku":"103-701-002","price":408.1,"currency_code":"USD","in_stock":true},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 16x25x9","offer_id":44118928851066,"sku":"103-701-003","price":0.0,"currency_code":"USD","in_stock":false},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 20x20x9","offer_id":44118928883834,"sku":"103-701-004","price":351.0,"currency_code":"USD","in_stock":true},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 20x24x9","offer_id":44118928916602,"sku":"103-701-005","price":451.4,"currency_code":"USD","in_stock":true},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 20x25x9","offer_id":44118928949370,"sku":"103-701-006","price":0.0,"currency_code":"USD","in_stock":false},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 24x24x9","offer_id":44118928982138,"sku":"103-701-007","price":226.1,"currency_code":"USD","in_stock":true},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 12x24x15","offer_id":44118929014906,"sku":"103-701-008","price":377.0,"currency_code":"USD","in_stock":true},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 16x20x15","offer_id":44118929047674,"sku":"103-701-009","price":0.0,"currency_code":"USD","in_stock":false},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 16x25x15","offer_id":44118929080442,"sku":"103-701-010","price":0.0,"currency_code":"USD","in_stock":false},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 20x20x15","offer_id":44118929113210,"sku":"103-701-011","price":235.75,"currency_code":"USD","in_stock":true},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 20x24x15","offer_id":44118929145978,"sku":"103-701-012","price":0.0,"currency_code":"USD","in_stock":false},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 20x25x15","offer_id":44118929178746,"sku":"103-701-013","price":0.0,"currency_code":"USD","in_stock":false},{"title":"2-Ply (high-capacity, progressively dense polyester) \/ 24x24x15","offer_id":44118929211514,"sku":"103-701-014","price":267.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/getimage2_ea111e77-a4e2-4b04-bc8c-a7e0a93e42eb.png?v=1777739854","url":"https:\/\/www.rememberthefilter.com\/products\/koch-duo-cap-cartridge-filter","provider":"RememberTheFilter.com","version":"1.0","type":"link"}