{"product_id":"25x16x4-koch-micromax-pl4s-header-merv-15-120-615-2516","title":"25x16x4 Koch MicroMAX PL4S Header Style MERV 15 120-615-2516 (3 Filters)","description":"\u003cp\u003eThis \u003cstrong\u003e25″ × 16″ × 4″\u003c\/strong\u003e \u003cstrong\u003eKoch MicroMAX PL4S Header Style\u003c\/strong\u003e filter (part number 120-615-2516) delivers \u003cstrong\u003eMERV 15\u003c\/strong\u003e filtration in a 4-inch-deep extended-surface minipleat design with \u003cstrong\u003e100% synthetic media\u003c\/strong\u003e, a plastic frame, and a \u003cstrong\u003efactory-installed peripheral header for side-access housings\u003c\/strong\u003e.\u003c\/p\u003e\u003cp\u003eThis is the same proven PL4S construction trusted in commercial HVAC — 4″ depth, all-synthetic dual-layer media, plastic frame, and minipleat geometry — with one critical addition: the peripheral header on the air-entering face. The header guides the filter into side-access housing tracks and seals against the housing gasket on installation, replacing the open-edge box-style construction with a configured fit for side-loaded AHUs. The synthetic-media advantage carries over: this filter holds up to humidity, marine and coastal air, frequent wet\/dry cycles, and aggressive face velocities where micro fiberglass paper can shed or weaken.\u003c\/p\u003e\u003ch3\u003eWhen MicroMAX PL4S Header Style is specified\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSide-access air handler housings\u003c\/strong\u003e — the peripheral header is the standard interface for side-loaded commercial AHUs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFront-load holding frames that require header sealing\u003c\/strong\u003e — matches existing system design without retrofit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-moisture environments\u003c\/strong\u003e — coastal, marine, humid industrial; synthetic media doesn’t shed or weaken the way glass-fiber paper can\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-velocity HVAC\u003c\/strong\u003e — rigid extended-surface construction in synthetic media maintains pleat geometry under turbulent airflow\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable-air-volume (VAV) systems\u003c\/strong\u003e — reliable performance through airflow swings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHospitals, pharmaceutical, and lab facilities\u003c\/strong\u003e — proven media reliability in critical IAQ environments\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDesign and construction\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e 100% synthetic, extended-surface minipleat construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame:\u003c\/strong\u003e Plastic with factory-installed peripheral header (Header Style)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeader:\u003c\/strong\u003e Factory-bonded to the air-entering side for side-access installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia-pack-to-frame seal:\u003c\/strong\u003e Bonded to entire frame periphery (eliminates air bypass)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Extended-surface minipleat, 4″ nominal depth\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficiency rating:\u003c\/strong\u003e MERV 15 per ASHRAE 52.2-2017\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eListings:\u003c\/strong\u003e UL Classified per UL Standard 900\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing:\u003c\/strong\u003e ISO 9001 registered facility\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended final resistance:\u003c\/strong\u003e 1.5″ w.g.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack size:\u003c\/strong\u003e 3 filters per case\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat MERV 15 captures\u003c\/h3\u003e\u003cp\u003eVery high-efficiency filtration capturing virtually all sub-micron particles, including fine smoke, bacteria carriers, and most viruses. Specified in healthcare, pharmaceutical, and high-IAQ commercial systems where the next step up is HEPA-class filtration.\u003c\/p\u003e\u003ch3\u003eHeader Style vs. Box Style: which to choose\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eHeader Style\u003c\/strong\u003e (this filter) is built specifically for housings that load filters from the side and seal against a peripheral header on the air-entering face. The \u003cstrong\u003eBox Style\u003c\/strong\u003e (PL4S Box) is the standard front-loaded version used in most commercial filter slots and holding frames. Both share identical media and frame construction — the only difference is the header. Match this to your housing: if you currently run a header-style filter, replace it with the Header Style; if you run a standard box-style filter, the Box Style PL4S is the right SKU.\u003c\/p\u003e\u003ch3\u003ePL4S Header vs. PL6 Header: synthetic vs. microfiberglass\u003c\/h3\u003e\u003cp\u003eThe PL6 also offers a single-header configuration but uses micro fiberglass paper media instead of synthetic. Both header-style filters serve the same housing type; the choice comes down to environment. The \u003cstrong\u003ePL4S Header\u003c\/strong\u003e (this filter, 4″) is the right pick for high-moisture, marine, coastal, or high-velocity applications where synthetic media outperforms glass-fiber. The \u003cstrong\u003ePL6\u003c\/strong\u003e (6″) offers more dust-holding capacity and longer service life in standard dry-air commercial environments. Match depth to housing first; choose synthetic when moisture or velocity matters.\u003c\/p\u003e\u003ch3\u003eImportant sizing and ordering notes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes listed are nominal.\u003c\/strong\u003e Actual dimensions are slightly under nominal — standard for the industry; the filter slides into a nominal-sized slot without binding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecial sizes are not available.\u003c\/strong\u003e The MicroMAX PL4S Header Style ships only in the standard sizes listed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull carton quantities only.\u003c\/strong\u003e Per Koch’s shipping policy, MicroMAX PL4S ships in full carton quantities for safe transit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe header determines the air-entering face.\u003c\/strong\u003e Unlike the box-style version, the header style has a fixed orientation — install with the header facing the airstream.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eThe MicroMAX PL4S Header Style is interchangeable with most competitive 4-inch header-style minipleat filters in the same nominal size. It is the direct synthetic-media replacement for headered glass-fiber filters in moisture-prone or high-velocity installations.\u003c\/p\u003e","brand":"Koch","offers":[{"title":"Default Title","offer_id":44118789128314,"sku":"120-615-2516","price":481.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/koch_pl4s_header.png?v=1777660275","url":"https:\/\/www.rememberthefilter.com\/products\/25x16x4-koch-micromax-pl4s-header-merv-15-120-615-2516","provider":"RememberTheFilter.com","version":"1.0","type":"link"}