{"product_id":"filter-king-21x23-25x1-air-filter-4-pack-merv-8-pleated-filters","title":"Filter King 21x23.25x1 Air Filter 4-Pack - MERV 8 Pleated Filters","description":"\u003cp\u003eIn this review the Filter King 21x23.25x1 4-pack is assessed as a practical, value-oriented replacement filter for typical home HVAC systems; it is best for homeowners who want a balance of particle capture and airflow without specialty filtration. The single biggest reason to buy is straightforward: this pack delivers a MERV 8 pleated filter that is made in the USA and is built to trap common dust and allergen particles while still fitting standard 1 in slots, making it a sensible routine replacement option for most furnaces and air conditioners.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMERV 8 rating:\u003c\/strong\u003e Captures a wide range of airborne particles such as dust, pollen and pet dander while maintaining good airflow for HVAC efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleated design:\u003c\/strong\u003e The pleats increase surface area to extend the effective life of each filter compared with flat media options.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual size:\u003c\/strong\u003e Labeled 21 in x 23.25 in x 1 in with an actual thickness of 0.75 in, so buyers should verify fit before installation.\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, indicating domestic production and material sourcing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong service interval:\u003c\/strong\u003e Rated for up to 90 days of use depending on household conditions, providing a low-maintenance schedule for many users.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick installation:\u003c\/strong\u003e Simple open, slide and close design makes replacement fast and requires no tools.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis 4-pack is best suited to homeowners and renters who replace standard 1 in furnace and A\/C filters on a regular schedule and want improved everyday air quality without upgrading to higher-MERV, high-restriction media. It fits people who value a domestically made product and prefer a pleated filter that balances capture efficiency and airflow.\u003c\/p\u003e\n\u003cp\u003eThose who need HEPA-level filtration, have severe allergy or respiratory medical requirements, or use specialized air systems should look elsewhere, since a MERV 8 pleated filter is not intended to match hospital-grade or true HEPA performance.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEffective at reducing common household dust and allergens thanks to the MERV 8 media.\u003c\/li\u003e\n\u003cli\u003ePleated construction increases media area for longer useful life between changes.\u003c\/li\u003e\n\u003cli\u003eMade in the USA with clear EPA establishment identification for manufacturing origin.\u003c\/li\u003e\n\u003cli\u003eComes as a convenient 4-pack that reduces frequency of repurchase.\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 rather than a full 1 in, so some users report fit or perceived sturdiness differences.\u003c\/li\u003e\n\u003cli\u003eNot suitable for homes that require high-MERV or HEPA-level filtration for medical reasons.\u003c\/li\u003e\n\u003c\/ul\u003e\n\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\u003eRated MERV\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003e4-pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLabel size\u003c\/td\u003e\n\u003ctd\u003e21 in x 23.25 in x 1 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual size\u003c\/td\u003e\n\u003ctd\u003e21 in x 23.25 in x 0.75 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended replacement\u003c\/td\u003e\n\u003ctd\u003eEvery 30 to 90 days\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturing\u003c\/td\u003e\n\u003ctd\u003eMade in USA (EPA Establishment 103501-FL-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Filter King 21x23.25x1 4-pack is a practical, cost-conscious choice for routine home HVAC maintenance, delivering solid particle capture with good airflow and a pleated design that extends service life. It represents good value for most households that need dependable dust and allergen reduction without the higher resistance of specialty filters.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these filters compatible with standard 1 in slots?\u003c\/strong\u003e\u003cbr\u003eYes, they are intended for 1 in filter slots but note the actual thickness is 0.75 in so measure your housing for a snug fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should these filters be changed?\u003c\/strong\u003e\u003cbr\u003eManufacturer guidance recommends changing 1 in filters every 30 to 90 days depending on usage, pets and indoor air quality.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these provide HEPA-level filtration?\u003c\/strong\u003e\u003cbr\u003eNo, these are MERV 8 pleated filters and are suitable for general dust and allergen reduction but not HEPA-level capture.\u003c\/p\u003e","brand":"Filter King","offers":[{"title":"Default Title","offer_id":48669408297179,"sku":"B07FQWXCK9","price":66.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/719WVGtDGyL._AC_SL1500.jpg?v=1778642466","url":"https:\/\/gearmusthave.com\/products\/filter-king-21x23-25x1-air-filter-4-pack-merv-8-pleated-filters","provider":"GearMustHave","version":"1.0","type":"link"}