{"product_id":"koch-multi-test-rigid-mtr-45-merv-11-cartridge","title":"Koch Multi-Test Rigid MTR 45 (MERV 11) Self-Supported Cartridge Filter","description":"\u003cp\u003eThe Koch \u003cstrong\u003eMulti-Test Rigid MTR 45 Cartridge\u003c\/strong\u003e is a \u003cstrong\u003erigid self-supported extended-surface filter\u003c\/strong\u003e that drops directly into the air handler housing — \u003cstrong\u003eno basket framework required\u003c\/strong\u003e. The rigid construction holds the cartridge geometry on its own, so the filter can be installed in housings that don’t have an existing basket or in systems where the original basket has been removed. The MTR 45 tier delivers \u003cstrong\u003e45% dust spot efficiency\u003c\/strong\u003e per ASHRAE 52.1, which corresponds to approximately \u003cstrong\u003eMERV 11\u003c\/strong\u003e per the modern ASHRAE 52.2 test standard. Specified for mid-efficiency commercial HVAC and prefilter applications ahead of higher-MERV final stages.\u003c\/p\u003e\u003ch3\u003eRigid self-supported design (no basket required)\u003c\/h3\u003e\u003cp\u003eThis is the critical differentiator for the Multi-Test Rigid line: \u003cstrong\u003ethe cartridge supports itself\u003c\/strong\u003e. The frame and media construction hold their shape under airflow without external bracing. That means:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo basket framework needed.\u003c\/strong\u003e The cartridge installs directly into the housing — useful when the original equipment basket is missing, damaged, or wasn’t part of the original specification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect compatibility\u003c\/strong\u003e with side-access housings, top-load cabinets, and front-load AHU racks that don’t use Cambridge or Farr-style baskets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimplified installation\u003c\/strong\u003e — one component to install, replace, and dispose of. No basket cleaning or basket replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStable geometry under airflow\u003c\/strong\u003e — the rigid construction won’t collapse or distort under high-velocity airflow or pressure spikes.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor applications that \u003cem\u003edo\u003c\/em\u003e have Farr HP basket framework already installed, see the \u003cstrong\u003eMulti-Test Cartridge\u003c\/strong\u003e line (collapsible cartridges designed to fit Farr HP baskets). For Cambridge Hi-Cap and Side-Cap framework, see the \u003cstrong\u003eDuo-Cap\u003c\/strong\u003e line. The Multi-Test Rigid is the right pick when you don’t need or want a basket in your system.\u003c\/p\u003e\u003ch3\u003eWhy \"MTR 45\" naming — ASHRAE 52.1 vs 52.2\u003c\/h3\u003e\u003cp\u003eThe Multi-Test Rigid line uses the older \u003cstrong\u003eASHRAE 52.1 dust spot efficiency percentages\u003c\/strong\u003e for tier naming — the number after \"MTR\" is the approximate dust spot efficiency. For modern HVAC documentation against ASHRAE 52.2 (MERV), the industry-standard correspondence is:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMTR 45\u003c\/strong\u003e (45% dust spot) → approximately MERV 11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMTR 85\u003c\/strong\u003e (85% dust spot) → approximately MERV 13\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMTR 95\u003c\/strong\u003e (95% dust spot) → approximately MERV 14\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor applications requiring formal MERV documentation, reference Koch bulletin K-1080-A or contact us for the latest spec sheet.\u003c\/p\u003e\u003ch3\u003eMTR 45 performance characteristics\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInitial pressure drop (12″ depth):\u003c\/strong\u003e 0.16″ w.g.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInitial pressure drop (24″ depth):\u003c\/strong\u003e 0.40″ w.g.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended final pressure drop:\u003c\/strong\u003e 0.70″ w.g.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficiency:\u003c\/strong\u003e 45% dust spot efficiency per ASHRAE 52.1; approximately MERV 11 per ASHRAE 52.2\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 Rigid self-supported extended-surface cartridge filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e Synthetic high-efficiency media with rigid pleat structure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame compatibility:\u003c\/strong\u003e Drops directly into housings; no basket framework required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficiency rating:\u003c\/strong\u003e 45% dust spot efficiency per ASHRAE 52.1; approximately MERV 11 per ASHRAE 52.2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference bulletin:\u003c\/strong\u003e Koch K-1080-A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable depths:\u003c\/strong\u003e 12″ and 24″ (deeper cartridges deliver longer service life and lower pressure drop at equivalent capture)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable face sizes:\u003c\/strong\u003e 12x24 and 24x24\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by the case.\u003c\/strong\u003e Carton quantity varies by size: 12x24x12 ships 4 per case; 24x24x12 ships 2 per case; 24x24x24 ships 1 per case; 12x24x24 ships 2 per case. The variant price is the case price.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhen the Multi-Test Rigid MTR 45 is specified\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMid-efficiency commercial HVAC final filtration\u003c\/strong\u003e — office buildings, schools, hotels where ~MERV 11 capture is the design target and basket framework isn’t available\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrefilter stages\u003c\/strong\u003e ahead of MERV 13+ final stages in multi-stage systems — the rigid form factor protects downstream filters and extends their service life\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight-industrial systems\u003c\/strong\u003e in housings without basket framework\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable-air-volume systems\u003c\/strong\u003e where the rigid geometry handles airflow swings without flexing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat ~MERV 11 captures\u003c\/h3\u003e\u003cp\u003eCaptures fine dust, smoke, auto fumes, and most airborne particles down to 1 micron. Strong general-purpose efficiency for offices, schools, hotels, and light industrial.\u003c\/p\u003e\u003ch3\u003eChoosing across the Multi-Test Rigid line\u003c\/h3\u003e\u003cp\u003eKoch offers three efficiency tiers in the Multi-Test Rigid line, all rigid self-supported and basket-free:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMTR 45 (this product) (~MERV 11):\u003c\/strong\u003e 45% dust spot efficiency. For mid-efficiency commercial and prefilter applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMTR 85 (~MERV 13):\u003c\/strong\u003e 85% dust spot efficiency. For high-IAQ commercial and healthcare facilities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMTR 95 (~MERV 14):\u003c\/strong\u003e 95% dust spot efficiency. For pharmaceutical, surgical, and HEPA pre-stage applications.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf your application calls for a different efficiency tier, see the matching sister product. All three Multi-Test Rigid tiers share the same rigid self-supported geometry — the difference is just which efficiency tier matches your design spec.\u003c\/p\u003e\u003ch3\u003eOther Koch cartridge filter options\u003c\/h3\u003e\u003cp\u003eIf your facility has existing basket framework, Koch also offers basket-compatible cartridges:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-Test Cartridge:\u003c\/strong\u003e Collapsible cartridges designed for Farr HP basket framework. Four efficiency tiers (MT 20\/50, MT 50\/60, MT 80\/90, MT 90\/95).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuo-Cap:\u003c\/strong\u003e Cartridge filters for Cambridge Hi-Cap and Side-Cap basket framework. MERV 8 in 1-Ply and 2-Ply construction.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eMatch the cartridge family to the framework already installed in your equipment. The Multi-Test Rigid is the right pick when no basket framework is available or desired.\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., 24x24x12). Match all three dimensions to your housing — rigid cartridges cannot be cut or trimmed in the field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLimited stock sizes.\u003c\/strong\u003e Multi-Test Rigid cartridges are typically build-to-order due to their specialty applications and rigid construction. Many sizes ship as quoted orders rather than from stock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\"Call for Quote\" sizes:\u003c\/strong\u003e Most Multi-Test Rigid 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\u003eHeavy shipping weight.\u003c\/strong\u003e Rigid cartridges weigh substantially more than collapsible alternatives (15-34 lbs each). Shipping rates reflect actual carrier weight.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Koch","offers":[{"title":"12x24x12","offer_id":44118931144826,"sku":"108-703-001","price":0.0,"currency_code":"USD","in_stock":false},{"title":"24x24x12","offer_id":44118931177594,"sku":"108-703-002","price":0.0,"currency_code":"USD","in_stock":false},{"title":"12x24x24","offer_id":44118931210362,"sku":"108-703-004","price":0.0,"currency_code":"USD","in_stock":false},{"title":"24x24x24","offer_id":44118931243130,"sku":"108-703-003","price":0.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/800x800_063cc2f8-a10d-4f53-9818-7b31658762ae.jpg?v=1777740893","url":"https:\/\/www.rememberthefilter.com\/products\/koch-multi-test-rigid-mtr-45-merv-11-cartridge","provider":"RememberTheFilter.com","version":"1.0","type":"link"}