{"product_id":"filter-king-21-53-5-1-air-filter-4-pack-merv-8-actual-size-21-x-53-5-x-75-fk21x53-5x1a-m8-4","title":"Filter King 21×53.5×1 Air Filter 4-PACK MERV 8 Actual Size 21 x 53.5 x .75″ – FK21x53.5x1A-M8 -4","description":"\u003cp data-start=\"134\" data-end=\"153\"\u003e\u003cstrong data-start=\"134\" data-end=\"153\"\u003eFK21x53.5x1A-M8\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"154\" data-end=\"498\"\u003e\n\u003cli data-start=\"154\" data-end=\"264\"\u003e\n\u003cp data-start=\"156\" data-end=\"264\"\u003e\u003cstrong data-start=\"156\" data-end=\"162\"\u003eFK\u003c\/strong\u003e – Likely stands for \u003cem data-start=\"183\" data-end=\"209\"\u003eFilter, Knife-edge style\u003c\/em\u003e or a specific series\/model prefix from a manufacturer.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"265\" data-end=\"389\"\u003e\n\u003cp data-start=\"267\" data-end=\"313\"\u003e\u003cstrong data-start=\"267\" data-end=\"280\"\u003e21x53.5x1\u003c\/strong\u003e – The \u003cstrong data-start=\"287\" data-end=\"310\"\u003enominal filter size\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul data-start=\"316\" data-end=\"389\"\u003e\n\u003cli data-start=\"316\" data-end=\"338\"\u003e\n\u003cp data-start=\"318\" data-end=\"338\"\u003e\u003cstrong data-start=\"318\" data-end=\"327\"\u003e21 in\u003c\/strong\u003e (height)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"341\" data-end=\"364\"\u003e\n\u003cp data-start=\"343\" data-end=\"364\"\u003e\u003cstrong data-start=\"343\" data-end=\"354\"\u003e53.5 in\u003c\/strong\u003e (width)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"367\" data-end=\"389\"\u003e\n\u003cp data-start=\"369\" data-end=\"389\"\u003e\u003cstrong data-start=\"369\" data-end=\"377\"\u003e1 in\u003c\/strong\u003e (thickness)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"390\" data-end=\"498\"\u003e\n\u003cp data-start=\"392\" data-end=\"498\"\u003e\u003cstrong data-start=\"392\" data-end=\"400\"\u003eA-M8\u003c\/strong\u003e – Usually a manufacturer’s \u003cem data-start=\"428\" data-end=\"441\"\u003eseries\/code\u003c\/em\u003e for the media type, frame style, or MERV rating variant.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"500\" data-end=\"563\"\u003e\u003cstrong data-start=\"500\" data-end=\"508\"\u003e“-4”\u003c\/strong\u003e at the end typically means:\u003c\/p\u003e","brand":"Filter King","offers":[{"title":"Default Title","offer_id":50890054926631,"sku":"FK21x53.5x1A-M8 -4","price":132.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/4780\/2407\/files\/2153.webp?v=1767669485","url":"https:\/\/hvacdirect.store\/products\/filter-king-21-53-5-1-air-filter-4-pack-merv-8-actual-size-21-x-53-5-x-75-fk21x53-5x1a-m8-4","provider":"WholesaleHVACDirect","version":"1.0","type":"link"}