{"product_id":"koch-duo-pak-40-2-ply-merv-8-pocket-filter","title":"Koch Duo-Pak 40 2-Ply MERV 8 Two-Pocket Synthetic Filter - Sold by the Case","description":"\u003cp\u003eThe Koch \u003cstrong\u003eDuo-Pak 40 2-Ply MERV 8 Two-Pocket Filter\u003c\/strong\u003e is a deep synthetic pocket filter designed as an \u003cstrong\u003eupgrade from 4″ or 6″ pleated panel filters\u003c\/strong\u003e in commercial and industrial holding-frame and flat-bank side-access housing installations. The two-pocket form factor more than doubles the effective filter media area compared to a flat panel of the same face dimensions, delivering \u003cstrong\u003esignificantly longer service life\u003c\/strong\u003e at competitive cost. The 2-Ply configuration is engineered for MERV 8 final filtration with extended service life.\u003c\/p\u003e\u003ch3\u003eWhat a two-pocket filter is (and where it goes)\u003c\/h3\u003e\u003cp\u003eTwo-pocket filters are \u003cstrong\u003eextended-surface filters\u003c\/strong\u003e with the synthetic media stitched into \u003cstrong\u003etwo deep pockets\u003c\/strong\u003e that extend back into the airstream. The pocket geometry packs several times more media area into the same face footprint as a flat panel filter — meaning longer service life, lower pressure drop at equivalent capture, and substantially better dust holding capacity for the same install footprint.\u003c\/p\u003e\u003cp\u003ePocket filters drop into \u003cstrong\u003estandard holding frames or flat-bank side-access housings\u003c\/strong\u003e commonly found in commercial AHUs, large packaged rooftop units, and industrial air handlers. They’re typically deployed where 4″ or 6″ pleated panels were previously used — same form factor for the housing, dramatically more media surface area for extended service life.\u003c\/p\u003e\u003ch3\u003eWhy specify Duo-Pak 40 over 4″ or 6″ pleated panels\u003c\/h3\u003e\u003cp\u003eDuo-Pak 40 filters are positioned by Koch as the \u003cstrong\u003edirect replacement for 4″ and 6″ pleat applications\u003c\/strong\u003e — same install footprint, longer service life, lower changeout frequency. Three operational benefits result:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLonger service life:\u003c\/strong\u003e The two-pocket extended-surface design holds several times more dust before reaching terminal pressure drop than a flat 4″ or 6″ pleat in the same face dimensions. Fewer changeouts per year reduces both filter cost and labor cost.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-sealing design:\u003c\/strong\u003e The 9-gauge wire frame creates a perimeter that seals against the holding frame on its own — no clips, no fasteners, no separate sealing gasket. The filter expands against the rack and stays put. Faster installation and removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEliminated bypass:\u003c\/strong\u003e Self-sealing geometry eliminates the gaps that happen when conventional panel filters shift in their racks, which lets unfiltered air pass through. Continuous perimeter seal means continuous capture.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAbout the 2-Ply configuration\u003c\/h3\u003e\u003cp\u003eThe 2-Ply Duo-Pak 40 uses \u003cstrong\u003etwo layers of progressively dense polyester media\u003c\/strong\u003e — coarser media on the upstream side, finer media on the downstream side. This staged-capture geometry is what enables \u003cstrong\u003eMERV 8 efficiency\u003c\/strong\u003e in the pocket form factor while still maintaining manageable pressure drop. Initial pressure drop is \u003cstrong\u003e0.15″ w.g. at 500 FPM\u003c\/strong\u003e. The right pick for high-IAQ commercial HVAC, healthcare, hospitality, and high-occupancy commercial buildings where MERV 8 capture is the design target.\u003c\/p\u003e\u003ch3\u003eDesign and construction\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Two-pocket extended-surface synthetic filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e Two-ply progressively dense polyester (100% synthetic, high-moisture tolerant)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame:\u003c\/strong\u003e 9-gauge internal steel wire (self-sealing, fits standard holding frames without clips or fasteners)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePockets:\u003c\/strong\u003e 2 (per filter)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficiency rating:\u003c\/strong\u003e MERV 8 per ASHRAE Test Standard 52.2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInitial pressure drop:\u003c\/strong\u003e 0.15″ w.g. at 500 FPM face velocity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference bulletin:\u003c\/strong\u003e Koch PB-798-6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by the case.\u003c\/strong\u003e The variant price is the case price.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhen the Duo-Pak 40 2-Ply is specified\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard commercial HVAC final filtration\u003c\/strong\u003e — office buildings, schools, hotels, healthcare where MERV 8 is the target\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHospitals and clinics\u003c\/strong\u003e — general-purpose air handling and final filter stages where MERV 8 capture and extended service life both matter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial facilities\u003c\/strong\u003e — manufacturing, warehousing, process environments needing MERV 8 capture in pocket-filter form factor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement for 4″ or 6″ MERV 8 pleated panels\u003c\/strong\u003e — significantly longer service life at MERV 8 capture\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable-air-volume systems\u003c\/strong\u003e where the deep pocket geometry handles airflow swings better than flat panels\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat MERV 8 captures\u003c\/h3\u003e\u003cp\u003eCaptures dust mite debris, pollen, mold spores, pet dander, and most household and office airborne dust. The standard residential and commercial efficiency for everyday indoor air quality, balancing capture performance with airflow.\u003c\/p\u003e\u003ch3\u003eChoosing across the Duo-Pak 40 line\u003c\/h3\u003e\u003cp\u003eKoch offers two ply configurations in the Duo-Pak 40 series:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuo-Pak 40 1-Ply (MERV 7):\u003c\/strong\u003e Tackified single-density polyester. Economical, primary-filter applications and high dust holding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuo-Pak 40 2-Ply (MERV 8):\u003c\/strong\u003e Two-ply progressively dense polyester. High-IAQ commercial, healthcare, and final-filter applications.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf your application calls for the other tier, see the matching sister product: \u003cstrong\u003eKoch Duo-Pak 40 1-Ply MERV 7 (104-700)\u003c\/strong\u003e — same form factor and self-sealing design, just step down for economical MERV 7 capture at lower pressure drop.\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 Pocket filters are sized as Width x Height x Depth (e.g., 24x24x15). Match all three dimensions to your holding frame — pocket filters cannot be cut or trimmed in the field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by the case.\u003c\/strong\u003e Variant price is for the full case. Case quantities are listed in each variant.\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 MERV or different filter form factor?\u003c\/strong\u003e See the Koch Duo-Cube line (1-Ply through 4-Ply, MERV 6 through MERV 8) for cube-style equivalents in deeper depths, or contact us for higher-MERV pocket and bag filter options.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Koch","offers":[{"title":"12x24x15","offer_id":44118927966330,"sku":"104-701-006","price":555.8,"currency_code":"USD","in_stock":true},{"title":"16x20x15","offer_id":44118927999098,"sku":"104-701-001","price":553.9,"currency_code":"USD","in_stock":true},{"title":"16x25x15","offer_id":44118928031866,"sku":"104-701-002","price":564.9,"currency_code":"USD","in_stock":true},{"title":"20x20x15","offer_id":44118928064634,"sku":"104-701-003","price":543.0,"currency_code":"USD","in_stock":true},{"title":"20x24x15","offer_id":44118928097402,"sku":"104-701-005","price":557.0,"currency_code":"USD","in_stock":true},{"title":"20x25x15","offer_id":44118928130170,"sku":"104-701-004","price":555.5,"currency_code":"USD","in_stock":true},{"title":"24x24x15","offer_id":44118928162938,"sku":"104-701-007","price":602.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/getimage2_0c1f1b8e-2adc-457b-9b10-b4c506c94e7e.png?v=1777739512","url":"https:\/\/www.rememberthefilter.com\/products\/koch-duo-pak-40-2-ply-merv-8-pocket-filter","provider":"RememberTheFilter.com","version":"1.0","type":"link"}