{"product_id":"filter-king-af21x21x1-m13-merv-13-air-filter-21x21x1","title":"Filter King AF21x21x1-M13 Merv 13 Air Filter 21x21x1","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe FILTER KING AF21x21x1-M13 is a MERV 13 pleated air filter designed for residential and light commercial HVAC systems. With a nominal size of 21x21x1 and an actual size of 20.5 x 20.5 x 0.75 inches, it fits standard 1-inch filter slots. At MERV 13, this filter captures fine particulates including dust, pollen, mold spores, pet dander, and fine smoke particles — making it a common choice for systems where indoor air quality is a priority. HVAC technicians and building maintenance personnel typically specify this rating for improved filtration without excessive static pressure drop. This listing includes a quantity of 10 filters.\u003c\/p\u003e\n\u003cp\u003eThis filter is suited for residential forced-air systems and light commercial applications where a 21x21x1 nominal filter slot is present. It installs in the return air grille or air handler filter rack. The MERV 13 rating is appropriate for systems where occupant health, allergen control, or smoke mitigation are considerations. Verify that the air handler or furnace blower is rated to handle the increased resistance of a MERV 13 filter before installation — older or undersized blower motors may experience reduced airflow.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eMERV 13 filtration rating captures fine particulates down to 1 micron\u003c\/li\u003e\n  \u003cli\u003eNominal size 21x21x1 inches fits standard 1-inch filter slots\u003c\/li\u003e\n  \u003cli\u003eActual dimensions 20.5 x 20.5 x 0.75 inches for proper fit in housing\u003c\/li\u003e\n  \u003cli\u003ePleated media construction increases surface area and filter life\u003c\/li\u003e\n  \u003cli\u003eSold in a 10-pack for routine maintenance stocking\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for HVAC systems, furnaces, and air handlers with a 21x21x1 nominal 1-inch filter slot. Verify actual opening dimensions against the filter actual size of 20.5 x 20.5 x 0.75 inches before installation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eHVAC technicians and qualified service personnel should power down the air handler or furnace at the disconnect before replacing filters. Install with the airflow arrow on the filter frame pointing toward the blower. Check the existing filter frame or housing for actual clearance dimensions to confirm fit before ordering in bulk. Inspect and replace on a schedule appropriate to occupancy load and environmental conditions — MERV 13 filters may require more frequent changes than lower-rated media in high-particulate environments.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMERV Rating\u003c\/strong\u003e: 13\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Size\u003c\/strong\u003e: 21 x 21 x 1 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eActual Size\u003c\/strong\u003e: 20.5 x 20.5 x 0.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity per Order\u003c\/strong\u003e: 10 filters\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: FILTER KING\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: AF21x21x1-M13\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Filter King","offers":[{"title":"Default Title","offer_id":51716783538482,"sku":"AF21x21x1-M13","price":15.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a52058a58898bd868caa4900d6557b74_dc224159-f1eb-4a3a-ae4d-9935ffefd3cc.jpg?v=1788531683","url":"https:\/\/voomisupply.com\/products\/filter-king-af21x21x1-m13-merv-13-air-filter-21x21x1","provider":"Voomi Supply","version":"1.0","type":"link"}