{"product_id":"koch-super-grade-fiberglass-4-inch-pad-merv-4","title":"Koch Super Grade 4\" (Fiberglass, Yellow\/Gold Tint Downstream) Pad - MERV 4","description":"\u003cp\u003eThe Koch \u003cstrong\u003eSuper Grade 4\" Fiberglass Pre-Cut Media Pad\u003c\/strong\u003e is a flat fiberglass filter pad in standard HVAC face sizes, designed for deep 4-inch frame applications, extended-service-life installations, and industrial pad rack systems where dust holding capacity matters most. The pad is constructed of \u003cstrong\u003econtinuous-filament spun glass fibers\u003c\/strong\u003e arranged in a progressively dense blanket and coated with Koch's special adhesive gel for enhanced dust holding capacity. Each pad is color-coded with \u003cstrong\u003eWhite upstream \/ Yellow\/Gold downstream\u003c\/strong\u003e for easy installation orientation.\u003c\/p\u003e\u003ch3\u003eWhat you get: sold by the case\u003c\/h3\u003e\u003cp\u003ePre-cut fiberglass pads are \u003cstrong\u003esold by the case\u003c\/strong\u003e, not individually. The price you see for each variant is the \u003cstrong\u003efull case price\u003c\/strong\u003e, and each variant label tells you exactly how many pads are in that case. Case counts by size:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e16x20x4\u003c\/strong\u003e — \u003cstrong\u003e25 pads per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16x25x4\u003c\/strong\u003e — \u003cstrong\u003e25 pads per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20x20x4\u003c\/strong\u003e — \u003cstrong\u003e25 pads per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20x25x4\u003c\/strong\u003e — \u003cstrong\u003e25 pads per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24x24x4\u003c\/strong\u003e — \u003cstrong\u003e25 pads per case\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNeed a partial case, individual-pad pricing, or a different quantity than the standard case? \u003ca href=\"\/pages\/quote\"\u003eRequest a quote\u003c\/a\u003e with your exact count and we can work out the pricing.\u003c\/p\u003e\u003ch3\u003eWhy fiberglass at this efficiency tier\u003c\/h3\u003e\u003cp\u003eKoch Super Grade fiberglass pads are engineered for \u003cstrong\u003emaximum airflow with reliable dust capture\u003c\/strong\u003e. The progressively dense spun-glass construction lets air pass through with minimal restriction while the adhesive-gel-coated fibers trap larger particulates deep in the media. Efficiency builds as the media loads — coarse particles caught upstream help capture finer particles further downstream.\u003c\/p\u003e\u003cp\u003eThis is an \u003cstrong\u003eequipment-protection efficiency tier\u003c\/strong\u003e, suited to systems where high airflow and continuous service matter more than fine-particle capture. The 4\" format is specified when deep 4-inch frame applications, extended-service-life installations, and industrial pad rack systems where dust holding capacity matters most.\u003c\/p\u003e\u003ch3\u003eWhere 4\" Super Grade pads are used\u003c\/h3\u003e\u003cp\u003ePre-cut fiberglass pads are the filter medium itself — they slide into reusable pad frames, get held by retention grids in blanket installations, or stack into pad rack systems. Common applications:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep 4-inch frame applications\u003c\/strong\u003e in commercial and industrial HVAC where extended service life is the priority\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial pad rack systems\u003c\/strong\u003e with 4-inch deep racks for high-dust-load environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong-interval maintenance schedules\u003c\/strong\u003e — 4-inch construction holds dust for 2-3x longer than 1-inch equivalents\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-stage filtration\u003c\/strong\u003e in large air handlers ahead of MERV 11+ final stages\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing and warehouse facilities\u003c\/strong\u003e where shutdown for filter changes is expensive\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuper Grade 4\" construction and specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e Spun glass fiberglass, continuous filaments, progressively dense graded blanket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdhesive treatment:\u003c\/strong\u003e Special adhesive gel coating on each fiber - creates \"wicking\" action that enhances dust holding capacity beyond standard fiberglass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor coding:\u003c\/strong\u003e White upstream \/ Yellow\/Gold downstream (downstream tint for easy installation orientation)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDepth:\u003c\/strong\u003e 4\" (4 inches nominal)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable face sizes:\u003c\/strong\u003e 16x20, 16x25, 20x20, 20x25, 24x24\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMERV rating:\u003c\/strong\u003e 4 per ASHRAE 52.2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference bulletin:\u003c\/strong\u003e Koch K 386D\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat MERV 4 captures\u003c\/h3\u003e\u003cp\u003eCaptures larger airborne dust, lint, hair, pollen, and dust mite debris at high airflow. The deeper 4-inch construction extends service life dramatically through graduated depth loading - finer particles get caught further into the media as the upstream layers fill.\u003c\/p\u003e\u003ch3\u003eChoosing across the Super Grade fiberglass line\u003c\/h3\u003e\u003cp\u003eKoch offers Super Grade fiberglass pads in three depths to match different frame and service-life requirements:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuper Grade 1\" (MERV 3):\u003c\/strong\u003e shallowest depth, residential and 1-inch frame applications, blue tint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuper Grade 2\" (MERV 3):\u003c\/strong\u003e mid-depth, commercial 2-inch frame and pad rack applications, blue tint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuper Grade 4\" (this product) (MERV 4):\u003c\/strong\u003e deepest, extended service life, industrial pad rack and high-volume installations, yellow\/gold tint\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eMatch the depth to your existing frame slot. The 1-inch and 2-inch versions share MERV 3 efficiency — choose by your frame depth. The 4-inch version steps up to MERV 4 with significantly extended service life through graduated depth loading.\u003c\/p\u003e\u003ch3\u003eNeed synthetic instead of fiberglass?\u003c\/h3\u003e\u003cp\u003eFor applications where fiberglass break-off is not permitted (food processing, pharmaceutical environments, hospitals with sensitive downstream filtration), Koch also offers a complete line of synthetic polyester pre-cut pads in similar configurations. See the \u003cstrong\u003eSS5\/SS10\/SPT5\/SPT10\/SPT-30\/SPT-550\u003c\/strong\u003e synthetic pad line for all-polyester alternatives, including tackified and antimicrobial options.\u003c\/p\u003e\u003ch3\u003eSizing and ordering notes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatch face dimensions and depth to your existing frame.\u003c\/strong\u003e Pads are sized as Width x Height x Depth (e.g., 24x24x4). The depth is fixed for this product line at 4\" — chosen by which Super Grade product you order, not by the variant.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEach variant shows its case quantity in the dropdown label.\u003c\/strong\u003e Look for \"(Case of N)\" next to each size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable in 5 standard HVAC face sizes:\u003c\/strong\u003e 16x20, 16x25, 20x20, 20x25, 24x24. For non-standard sizes or bulk roll lengths, \u003ca href=\"\/pages\/quote\"\u003erequest a quote\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePads can be field-cut\u003c\/strong\u003e to non-standard dimensions if needed. Note: fiberglass cuts release loose fibers; cut on a clean surface and dispose of trimmings carefully.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrames sold separately.\u003c\/strong\u003e Pre-cut pads are the filter medium — they require a reusable pad frame, retention grid, or pad rack to install in the air handler. Contact us for compatible frame and rack options.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk roll versions also available.\u003c\/strong\u003e Super Grade fiberglass is also sold in bulk rolls for cut-to-size facility-scale applications. \u003ca href=\"\/pages\/quote\"\u003eRequest a quote\u003c\/a\u003e for bulk roll pricing and lengths.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Koch","offers":[{"title":"16x20x4 (Case of 25)","offer_id":44119076601978,"sku":"582-016-0020","price":114.5,"currency_code":"USD","in_stock":true},{"title":"16x25x4 (Case of 25)","offer_id":44119076634746,"sku":"582-016-0025","price":174.75,"currency_code":"USD","in_stock":true},{"title":"20x20x4 (Case of 25)","offer_id":44119076667514,"sku":"582-020-0020","price":195.5,"currency_code":"USD","in_stock":true},{"title":"20x25x4 (Case of 25)","offer_id":44119076700282,"sku":"582-020-0025","price":242.5,"currency_code":"USD","in_stock":true},{"title":"24x24x4 (Case of 25)","offer_id":44119076733050,"sku":"582-024-0024","price":203.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/getimage2_1c31b5b3-566e-4a87-9d69-dcef9a131e9f.png?v=1777813867","url":"https:\/\/www.rememberthefilter.com\/products\/koch-super-grade-fiberglass-4-inch-pad-merv-4","provider":"RememberTheFilter.com","version":"1.0","type":"link"}