{"product_id":"koch-duo-cube-3-ply-merv-8-cube-filter","title":"Koch Duo-Cube 3-Ply MERV 8 Anti-Microbial Synthetic Cube Filter - Sold by the Case","description":"\u003cp\u003eKoch \u003cstrong\u003eDuo-Cube 3-Ply MERV 8 Cube Filters\u003c\/strong\u003e are \u003cstrong\u003ehigh medium efficiency\u003c\/strong\u003e extended-surface synthetic cube filters built on a three-ply blend of progressively dense polyester media with \u003cstrong\u003eanti-microbial treatment\u003c\/strong\u003e and \u003cstrong\u003eintegral steel wire support\u003c\/strong\u003e. The 3-Ply tier sits at the high-efficiency end of the Duo-Cube line — substantially better capture than 1-Ply or 2-Ply at the cost of marginally higher pressure drop, with the anti-microbial treatment as a meaningful upgrade for installations where biological loading on the filter media matters.\u003c\/p\u003e\u003ch3\u003eWhat a cube filter is (and where it goes)\u003c\/h3\u003e\u003cp\u003eCube filters are \u003cstrong\u003eextended-surface filters\u003c\/strong\u003e — the media is folded or pleated into a deep three-dimensional cube that increases the effective filtering surface area dramatically compared to a flat panel filter of the same face dimensions. A 24x24x12 cube has the same face footprint as a 24x24x12 panel, but several times more media area packed into that depth. This means longer service life, lower pressure drop at equivalent capture, and significantly better dust holding capacity.\u003c\/p\u003e\u003cp\u003eCube filters drop into \u003cstrong\u003eside-load cube baskets, top-load racks, or front-load holding frames\u003c\/strong\u003e commonly found in commercial AHUs, packaged rooftop units, and larger industrial air handlers. Typically deployed as a \u003cstrong\u003efinal filter stage\u003c\/strong\u003e behind a panel prefilter, capturing what makes it past the prefilter while the deep pleated geometry extends service life.\u003c\/p\u003e\u003ch3\u003eWhat \"3-Ply\" means and why it matters\u003c\/h3\u003e\u003cp\u003eThe Duo-Cube 3-Ply uses \u003cstrong\u003ethree layers of progressively dense polyester media\u003c\/strong\u003e stacked together — coarser media on the upstream side, finer media on the downstream side. This staged capture extends service life by distributing particle loading across all three layers rather than overloading the first layer the way a single-density filter does. The downstream-most layer captures the finest particles that make MERV 8 capture possible.\u003c\/p\u003e\u003cp\u003eThe integral wire frame creates a \u003cstrong\u003eself-sealing design\u003c\/strong\u003e — the filter expands against the rack perimeter and seals the gap on its own, eliminating bypass that happens when filters shift in their racks. Fits standard holding frames without clips or fasteners.\u003c\/p\u003e\u003ch3\u003eAnti-microbial treatment\u003c\/h3\u003e\u003cp\u003eThe 3-Ply Duo-Cube media is treated with an \u003cstrong\u003eanti-microbial agent\u003c\/strong\u003e that inhibits the growth of bacteria, fungi, and other microorganisms on captured organic matter (dust, skin cells, pollen, etc.). This protects the filter media itself from becoming a substrate for microbial growth over the filter’s service life — particularly relevant in \u003cstrong\u003ehealthcare environments, food processing, hospitality, and high-occupancy commercial buildings\u003c\/strong\u003e where captured biological material would otherwise grow on standard untreated media.\u003c\/p\u003e\u003cp\u003eThe anti-microbial treatment protects the filter; it does not actively kill airborne pathogens passing through the filter.\u003c\/p\u003e\u003ch3\u003eDesign and construction\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Extended-surface synthetic cube filter, 3-ply progressively dense media\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e 100% synthetic polyester (3-ply, anti-microbial treated)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoisture resistance:\u003c\/strong\u003e Suitable for high-moisture air handling applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame:\u003c\/strong\u003e Integral 9-gauge steel wire (self-sealing, fits standard holding frames without clips or fasteners)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-microbial:\u003c\/strong\u003e Yes (media-side treatment)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficiency rating:\u003c\/strong\u003e MERV 8 per ASHRAE Test Standard 52.2-2007\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference bulletin:\u003c\/strong\u003e Koch K111C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by the case.\u003c\/strong\u003e Carton quantity varies by depth: 8″ and 11″ depths ship 10 per case; 15″ depths ship 7 per case; 20″ depths ship 5 per case (with one exception: 12x24x20 ships 5 per case). The variant price is the case price.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhen the 3-Ply Duo-Cube is specified\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-IAQ commercial HVAC\u003c\/strong\u003e — office buildings, schools, retail, hospitality where MERV 8 is the design target\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHealthcare facilities\u003c\/strong\u003e — clinics, dental offices, medical buildings where anti-microbial protection on the filter media is a meaningful upgrade\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFood processing and hospitality\u003c\/strong\u003e — environments with elevated organic loading where standard untreated media would support microbial growth\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinal filtration in industrial systems\u003c\/strong\u003e — manufacturing, warehousing, process environments needing MERV 8 with extended service life\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy upgrade from conventional panel filters\u003c\/strong\u003e — when an existing system uses MERV 8 panel filters and the maintenance team wants longer changeout intervals at similar capture efficiency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable-air-volume systems\u003c\/strong\u003e where the deep pleated geometry handles airflow swings better than flat panels\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 residential applications, balancing capture performance with airflow.\u003c\/p\u003e\u003ch3\u003eChoosing across the Duo-Cube line\u003c\/h3\u003e\u003cp\u003eKoch offers four media tiers in the Duo-Cube cube filter family:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuo-Cube 1-Ply (MERV 6):\u003c\/strong\u003e Economical entry point, single-density poly media. Equipment protection and basic filtration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuo-Cube 2-Ply (MERV 7):\u003c\/strong\u003e Dual-ply gradient density, dry or tackified. Step up from 1-Ply for marginally better capture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuo-Cube 3-Ply (this product) (MERV 8):\u003c\/strong\u003e Three-ply blend with anti-microbial treatment. High medium efficiency for healthcare, food processing, and commercial HVAC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuo-Cube 4-Ply (MERV 8 max):\u003c\/strong\u003e Four-ply blend for the highest performance in the Duo-Cube series. Anti-microbial, highest dust holding capacity.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eStep down to 1-Ply if your application doesn’t require MERV 8 capture and pressure drop is the limiting factor. Step up to 4-Ply for maximum performance in critical applications. For most commercial MERV 8 applications, 3-Ply is the right choice — the anti-microbial treatment alone justifies the upgrade in most occupied buildings.\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 Cube filters are sized as Width x Height x Depth (e.g., 24x24x15). Match all three dimensions to your filter rack — cube filters cannot be cut or trimmed in the field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeader frame option available.\u003c\/strong\u003e The 3-Ply Duo-Cube can be ordered with an integrated header frame for installations that require it — \u003ca href=\"\/pages\/quote\"\u003erequest a quote\u003c\/a\u003e if you need the header-frame configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by the case.\u003c\/strong\u003e Variant price is for the full case. 8″-11″ depths typically ship 10 per case; 15″ depths ship 7 per case; 20″ depths ship 5 per case.\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\u003eCarton quantities are approximations.\u003c\/strong\u003e Per Koch policy, please state the exact number of filters required when ordering — we can adjust for partial cases on quoted orders.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Koch","offers":[{"title":"16x20x8","offer_id":44118926065786,"sku":"105-702-001","price":336.8,"currency_code":"USD","in_stock":true},{"title":"16x25x8","offer_id":44118926098554,"sku":"105-702-002","price":349.5,"currency_code":"USD","in_stock":true},{"title":"20x20x8","offer_id":44118926131322,"sku":"105-702-003","price":377.8,"currency_code":"USD","in_stock":true},{"title":"20x25x8","offer_id":44118926164090,"sku":"105-702-004","price":389.3,"currency_code":"USD","in_stock":true},{"title":"24x24x8","offer_id":44118926196858,"sku":"105-702-005","price":409.5,"currency_code":"USD","in_stock":true},{"title":"16x20x11","offer_id":44118926229626,"sku":"105-702-006","price":387.0,"currency_code":"USD","in_stock":true},{"title":"16x25x11","offer_id":44118926262394,"sku":"105-702-007","price":370.3,"currency_code":"USD","in_stock":true},{"title":"20x20x11","offer_id":44118926295162,"sku":"105-702-008","price":379.2,"currency_code":"USD","in_stock":true},{"title":"20x25x11","offer_id":44118926327930,"sku":"105-702-009","price":405.5,"currency_code":"USD","in_stock":true},{"title":"24x24x11","offer_id":44118926360698,"sku":"105-702-010","price":423.4,"currency_code":"USD","in_stock":true},{"title":"16x20x15","offer_id":44118926393466,"sku":"105-702-011","price":278.32,"currency_code":"USD","in_stock":true},{"title":"16x25x15","offer_id":44118926426234,"sku":"105-702-012","price":297.92,"currency_code":"USD","in_stock":true},{"title":"20x20x15","offer_id":44118926459002,"sku":"105-702-013","price":297.08,"currency_code":"USD","in_stock":true},{"title":"20x25x15","offer_id":44118926491770,"sku":"105-702-014","price":316.33,"currency_code":"USD","in_stock":true},{"title":"24x24x15","offer_id":44118926524538,"sku":"105-702-015","price":348.53,"currency_code":"USD","in_stock":true},{"title":"12x24x20","offer_id":44118926557306,"sku":"105-702-021","price":235.4,"currency_code":"USD","in_stock":true},{"title":"16x20x20","offer_id":44118926590074,"sku":"105-702-016","price":0.0,"currency_code":"USD","in_stock":false},{"title":"16x25x20","offer_id":44118926622842,"sku":"105-702-017","price":237.95,"currency_code":"USD","in_stock":true},{"title":"20x20x20","offer_id":44118926655610,"sku":"105-702-018","price":234.3,"currency_code":"USD","in_stock":true},{"title":"20x25x20","offer_id":44118926688378,"sku":"105-702-019","price":254.15,"currency_code":"USD","in_stock":true},{"title":"24x24x20","offer_id":44118926721146,"sku":"105-702-020","price":263.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/getimage2_73364230-2a6e-4436-822d-14bfc83db77c.png?v=1777738964","url":"https:\/\/www.rememberthefilter.com\/products\/koch-duo-cube-3-ply-merv-8-cube-filter","provider":"RememberTheFilter.com","version":"1.0","type":"link"}