{"product_id":"21x22x1-merv-11-air-filter-3-pack-pet-allergy-defense","title":"21x22x1 MERV 11 Air Filter 3-Pack - Pet \u0026 Allergy Defense","description":"\u003cp\u003eOur review of this 3-pack of 21x22x1 filters finds them best suited for homeowners and small businesses seeking improved indoor air quality without costly HVAC changes. The biggest reason to buy is the \u003cstrong\u003eMERV 11 performance\u003c\/strong\u003e in a convenient multi-pack: these pleated, electrostatically charged filters capture a high proportion of fine dust and pet dander while still allowing adequate airflow. Installation is simple, the frame construction feels robust, and the filters are a practical option for anyone wanting better filtration than basic fiberglass options.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eUniversal compatibility:\u003c\/strong\u003e Sized to fit 21x22x1 openings with an actual dimension of 20.50 in x 21.50 in x 0.75 in, they work in most furnaces, air conditioners, and heat pumps.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eMERV 11 filtration:\u003c\/strong\u003e Synthetic media rated to capture about 95% of dust and common allergens, offering stronger protection than lower MERV options.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eElectrostatic pleated media:\u003c\/strong\u003e With 14 pleats per ft the charged fibers trap more microscopic particles and extend life compared with basic fiberglass filters.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eDurable construction:\u003c\/strong\u003e Beverage board frames with dual wire backing resist temperature changes and handle repeated installation without deforming.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eMade in the USA:\u003c\/strong\u003e Built from industrial-grade, recyclable materials and manufactured domestically for quality control and dependability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis product is a good match for pet owners, allergy sufferers, and anyone who wants a clear upgrade from fiberglass filters without overly restricting airflow. The 3-pack format suits households that prefer less frequent buys and those who schedule filter swaps every 90 days.\u003c\/p\u003e\n\u003cp\u003eIt may not be ideal for systems that require nonstandard sizes or for buyers who need very high-efficiency HEPA-level filtration; those users should seek specialized filters or consult an HVAC professional. Also check measurements carefully, as the actual dimensions are slightly under nominal size.\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\u003eEffective \u003cstrong\u003eallergen and pet dander control\u003c\/strong\u003e thanks to MERV 11 media.\u003c\/li\u003e\n \u003cli\u003eLasts longer than fiberglass filters due to electrostatic pleats and denser media.\u003c\/li\u003e\n \u003cli\u003eSturdy beverage board frame with dual wire backing improves durability during heating and cooling cycles.\u003c\/li\u003e\n \u003cli\u003eMade in the USA from recyclable, industrial-grade materials.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eActual size is 20.50 in x 21.50 in x 0.75 in, which some customers found smaller than expected for 21x22x1 slots.\u003c\/li\u003e\n \u003cli\u003eNot a substitute for HEPA when the highest filtration level is required for medical or laboratory settings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n\u003ctd\u003eNominal size\u003c\/td\u003e\n\u003ctd\u003e21x22x1\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eActual size\u003c\/td\u003e\n\u003ctd\u003e20.50 in x 21.50 in x 0.75 in\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eFilter media\u003c\/td\u003e\n\u003ctd\u003eSynthetic electrostatically charged pleated media\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eMERV rating\u003c\/td\u003e\n\u003ctd\u003eMERV 11 (comparable to MPR 1200 \u0026amp; FPR 7)\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003ePleats\u003c\/td\u003e\n\u003ctd\u003e14 pleats per ft\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003ePack count\u003c\/td\u003e\n\u003ctd\u003e3-pack\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eCountry of manufacture\u003c\/td\u003e\n\u003ctd\u003eMade in the USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThis 3-pack of 21x22x1 MERV 11 filters is a practical, cost-effective upgrade for households and small businesses that want better dust and pet dander control without sacrificing airflow. Durable construction and longer life than fiberglass models make it good value for routine HVAC maintenance, provided the slightly smaller actual dimensions match the system slot.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should these filters be replaced?\u003c\/strong\u003e\u003cbr\u003eReplace every 90 days for typical use; households with heavy pet hair or allergies may need to change them more often.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill MERV 11 restrict my HVAC airflow?\u003c\/strong\u003e\u003cbr\u003eThese filters are designed to capture fine particles while maintaining airflow; most systems will operate normally but consult your HVAC manual if you have a high-efficiency or older system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these filters recyclable?\u003c\/strong\u003e\u003cbr\u003eThe frames are made from recyclable beverage board and the product is built with recyclable materials, but local recycling rules vary so check with your local program.\u003c\/p\u003e","brand":"Filterbuy","offers":[{"title":"Default Title","offer_id":48235795480795,"sku":"B09P228S7S","price":56.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81geZ_wMD4L._AC_SL1500_6bbb778d-039a-4221-a72a-30e3d67d3245.jpg?v=1770749977","url":"https:\/\/gearmusthave.com\/products\/21x22x1-merv-11-air-filter-3-pack-pet-allergy-defense","provider":"GearMustHave","version":"1.0","type":"link"}