{"product_id":"koch-filter-p421820-pleated-air-filter-18x20x2","title":"Koch Filter P421820 Pleated Air Filter 18x20x2","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe KOCH FILTER P421820 is a 2-inch pleated air filter measuring 18 x 20 x 2 inches, built for residential and light commercial HVAC systems that require deeper filtration than standard 1-inch media. The pleated design increases media surface area compared to flat-panel filters, supporting improved particle capture across a range of airborne contaminants while helping maintain balanced system airflow. Licensed HVAC technicians and qualified service professionals install this filter as part of routine preventive maintenance or scheduled filter change-outs.\u003c\/p\u003e\n\u003cp\u003eThis filter is suited for forced-air heating and cooling systems where a 2-inch filter slot is present in the air handler, furnace cabinet, or return-air grille. The 18 x 20 x 2-inch nominal size fits common residential air handler configurations. It is appropriate for systems requiring periodic filter replacement to sustain acceptable indoor air quality and protect blower components from dust accumulation.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eNominal dimensions of 18 x 20 x 2 inches fit standard 2-inch filter tracks and return-air grilles\u003c\/li\u003e\n  \u003cli\u003ePleated media design increases surface area for improved particle capture compared to flat-panel filters\u003c\/li\u003e\n  \u003cli\u003e2-inch depth provides extended filter life between change-outs relative to 1-inch media\u003c\/li\u003e\n  \u003cli\u003eSupports balanced airflow while capturing airborne dust, pollen, and particulates\u003c\/li\u003e\n  \u003cli\u003eDesigned for forced-air HVAC applications in residential and light commercial settings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement pleated air filter for forced-air HVAC systems requiring a nominal 18 x 20 x 2-inch filter.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by a licensed HVAC technician or qualified service professional. Power down the air handler or furnace at the disconnect or thermostat before opening the filter cabinet. Note the airflow direction arrow printed on the filter frame and orient the filter so the arrow points toward the blower. Replace filters at manufacturer-recommended intervals or when visual inspection shows heavy dust loading to prevent restricted airflow and blower strain.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter Type\u003c\/strong\u003e: Pleated Air Filter\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Length\u003c\/strong\u003e: 20 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Width\u003c\/strong\u003e: 18 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Depth\u003c\/strong\u003e: 2 inches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: KOCH FILTER\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: P421820\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KOCH FILTER","offers":[{"title":"Default Title","offer_id":51344344547634,"sku":"P421820","price":18.91,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/310555286.jpg?v=1782033678","url":"https:\/\/voomisupply.com\/products\/koch-filter-p421820-pleated-air-filter-18x20x2","provider":"Voomi Supply","version":"1.0","type":"link"}