{"product_id":"filter-king-11-5x21x1-air-filter-4-pack-merv-13-performance","title":"Filter King 11.5x21x1 Air Filter 4-Pack - MERV 13 Performance","description":"\u003cp\u003eIn this review the Filter King 11.5x21x1 air filter 4-pack is evaluated for homeowners who want stronger particle capture without sacrificing airflow. The bottom line: this MERV 13 pleated filter is best for people with allergy concerns or those wanting cleaner indoor air, delivering noticeably clearer air within 48 hours while remaining simple to install. The pack of four and a recommended 30-90 day change window also make it practical for routine maintenance of furnaces and A\/C systems.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMERV 13 rating:\u003c\/strong\u003e Traps a wide range of airborne particles to improve indoor air quality for allergy sufferers and general household use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleated design:\u003c\/strong\u003e Captures more particulates and extends the filter lifetime while maintaining system airflow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-pack convenience:\u003c\/strong\u003e Provides multiple replacements so homeowners can keep up with the recommended 30 to 90 day change cycle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in USA:\u003c\/strong\u003e Fully manufactured in the United States under EPA establishment number 103501-FL-1 for consistent material and construction quality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast installation:\u003c\/strong\u003e Simple open, slide and close installation makes filter changes quick and reduces the chance of improper fit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe Filter King 11.5x21x1 is aimed at homeowners and renters with standard 1 in filter slots who want a higher-efficiency option; it is particularly useful for families with allergy or respiratory sensitivity who will benefit from the \u003cstrong\u003eMERV 13\u003c\/strong\u003e level of particle capture. Buyers who replace filters regularly and prefer a multi-pack for convenience will find the four-count helpful.\u003c\/p\u003e\n\u003cp\u003eThose who need heavier-duty or thicker filters should look elsewhere, as this product is a 1 in (actual 0.75 in) pleated filter intended for systems designed for thin replacement filters. Also, if extreme structural rigidity is essential, note some users report the filter material can feel less sturdy than thicker media.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-efficiency \u003cstrong\u003eMERV 13\u003c\/strong\u003e capture improves perceived air clarity within days.\u003c\/li\u003e\n\u003cli\u003ePleated construction increases particle-holding capacity without reducing airflow.\u003c\/li\u003e\n\u003cli\u003eMade in USA construction offers traceable manufacturing and consistent quality.\u003c\/li\u003e\n\u003cli\u003eFour filters in one pack streamline scheduled replacements for a single system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eActual thickness is 0.75 in, not a full 1 in, so fit should be checked in some frames.\u003c\/li\u003e\n\u003cli\u003eSome customers report the pleated media can feel less sturdy and may compress if mishandled during installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eFilter King\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel count\u003c\/td\u003e\n\u003ctd\u003e4-pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated MERV\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal size\u003c\/td\u003e\n\u003ctd\u003e11.5 in x 21 in x 1 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual size\u003c\/td\u003e\n\u003ctd\u003e11.5 in x 21 in x 0.75 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMade in\u003c\/td\u003e\n\u003ctd\u003eUnited States (EPA Establishment 103501-FL-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended change interval\u003c\/td\u003e\n\u003ctd\u003e30 to 90 days\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Filter King 11.5x21x1 4-pack is a practical, higher-efficiency replacement for standard 1 in filter slots, offering noticeable air quality improvement and the convenience of multiple replacements. It is best for homeowners seeking stronger particle capture and routine maintenance; just confirm the 0.75 in actual thickness fits your frame and handle the pleated media carefully to avoid compression.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit a standard 1 in filter slot?\u003c\/strong\u003e\u003cbr\u003eYes, the nominal size is 11.5 in x 21 in x 1 in, but the actual thickness is 0.75 in, so measure your filter frame to ensure a good fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should these filters be changed?\u003c\/strong\u003e\u003cbr\u003eFilter King recommends changing 1 in filters every 30 to 90 days depending on household conditions and usage; many users replace them quarterly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these filters manufactured in the United States?\u003c\/strong\u003e\u003cbr\u003eYes, these filters are fully manufactured in the United States under EPA establishment number 103501-FL-1.\u003c\/p\u003e","brand":"Filter King","offers":[{"title":"Default Title","offer_id":48262274089179,"sku":"B07JCBSN13","price":82.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71B1aAbZDeL._AC_SL1500.jpg?v=1778331508","url":"https:\/\/gearmusthave.com\/products\/filter-king-11-5x21x1-air-filter-4-pack-merv-13-performance","provider":"GearMustHave","version":"1.0","type":"link"}