{"product_id":"filter-king-11-5x21-5x1-air-filter-4-pack-merv-8-pleated-filters","title":"Filter King 11.5x21.5x1 Air Filter 4-Pack - MERV 8 Pleated Filters","description":"\u003cp\u003eOur review of the Filter King 11.5x21.5x1 air filter 4-pack finds it best suited for homeowners and renters wanting reliable, no-fuss air filtration on a budget. The single biggest reason to buy is the combination of a true MERV 8 rating and a pleated design that captures more particles without noticeably restricting airflow, so indoor dust and airborne debris drop quickly. The pack is fully manufactured in the United States and arrives as a convenient 4-pack that is easy to install and replace, making routine maintenance straightforward.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMERV 8 rating:\u003c\/strong\u003e Provides effective mid-level filtration that captures common airborne particles while maintaining steady HVAC airflow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleated design:\u003c\/strong\u003e Increases filter surface area so the filter traps more dust and particulates and lasts longer between changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in USA:\u003c\/strong\u003e Fully manufactured domestically, offering consistent construction and materials with an EPA establishment number listed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-pack convenience:\u003c\/strong\u003e Supplies enough filters for multiple change cycles so homeowners can maintain filtration without frequent ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong service window:\u003c\/strong\u003e Rated to perform for up to 90 days depending on household conditions, with recommended changes every 30 to 90 days.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe Filter King 11.5x21.5x1 4-pack is ideal for typical households, apartments, and small offices that need reliable filtration to reduce dust and common airborne particles without the higher restriction of fine filters. It fits standard 1 in filter slots and works well for users who want an easy, regular replacement schedule and value domestic manufacturing.\u003c\/p\u003e\n\u003cp\u003ePeople who require medical-grade filtration, extremely allergen-prone environments, or extremely long filter life should look at higher MERV ratings or thicker filters; likewise, anyone needing custom cut sizes or nonstandard thickness should consider alternatives.\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\u003eGood balance of filtration and airflow due to the \u003cstrong\u003eMERV 8\u003c\/strong\u003e pleated media.\u003c\/li\u003e\n\u003cli\u003eMade in the USA with consistent materials and construction.\u003c\/li\u003e\n\u003cli\u003e4-pack provides value and simplifies scheduled replacements.\u003c\/li\u003e\n\u003cli\u003eEasy installation: open, slide and close works in most standard housings.\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 check fitment if housings are tight.\u003c\/li\u003e\n\u003cli\u003eSome users reported occasional difficulty during installation in older or irregular housings.\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\u003ePack size\u003c\/td\u003e\n\u003ctd\u003e4-pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated size\u003c\/td\u003e\n\u003ctd\u003e11.5 in x 21.5 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 21.5 in x 0.75 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMERV rating\u003c\/td\u003e\n\u003ctd\u003eMERV 8\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 - 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 11.5x21.5x1 air filter 4-pack is a practical, value-oriented choice for most homes and small offices because it balances effective \u003cstrong\u003eparticle capture\u003c\/strong\u003e with low airflow restriction and easy installation. For those who want reliable, domestically made 1 in replacement filters and plan routine maintenance, this set is a good buy; users needing thicker media or medical-grade filtration should consider other options.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the filters fit a standard 1 in slot?\u003c\/strong\u003e\u003cbr\u003eThe filters are sold as 11.5 in x 21.5 in x 1 in rated but the actual thickness is 0.75 in, so they fit most standard housings but check tight slots before purchase.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these filters truly made in the USA?\u003c\/strong\u003e\u003cbr\u003eYes, the product is fully manufactured in the United States and lists an EPA establishment number for reference.\u003c\/p\u003e","brand":"Filter King","offers":[{"title":"Default Title","offer_id":48251558396123,"sku":"B0CPT9FDK6","price":62.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/716TBlQvfrL._AC_SL1500.jpg?v=1776283418","url":"https:\/\/gearmusthave.com\/products\/filter-king-11-5x21-5x1-air-filter-4-pack-merv-8-pleated-filters","provider":"GearMustHave","version":"1.0","type":"link"}