{"product_id":"filterbuy-21x22x1-air-filter-merv-11-superior-pet-allergy-defense","title":"Filterbuy 21x22x1 Air Filter MERV 11 - Superior Pet \u0026 Allergy Defense","description":"\u003cp\u003eOur review of the Filterbuy 21x22x1 air filter finds it best suited for homeowners and small businesses seeking dependable allergen and pet dander control without sacrificing airflow. The clear takeaway is that this two-pack combines \u003cstrong\u003eMERV 11 performance\u003c\/strong\u003e with durable construction, offering longer life than basic fiberglass panels while remaining easy to install in most 21x22x1 filter slots (actual size 20.50 in x 21.50 in x 0.75 in). For those who want improved indoor air quality and an economical replacement cycle, this is a solid, no-nonsense option.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal compatibility:\u003c\/strong\u003e Sized to fit common furnace, air conditioner, and heat pump housings and designed to support HVAC efficiency in typical residential systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMERV 11 filtration:\u003c\/strong\u003e Synthetic media captures fine dust and pet allergens effectively while avoiding the heavy airflow restriction of higher MERV grades.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrostatic pleated media:\u003c\/strong\u003e Charged fibers and 14 pleats per ft increase particle capture and extend service life compared with flat fiberglass filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust frame:\u003c\/strong\u003e Beverage board frames with dual wire backing resist warping and temperature extremes better than simple cardboard frames.\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 consistent quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis filter is ideal for homeowners or small commercial spaces that need improved air quality for occupants with allergies or pets but do not require HEPA-level filtration. It works well for routine HVAC maintenance cycles and those who prefer a balanced trade-off between particle capture and system airflow.\u003c\/p\u003e\u003cp\u003eThose who need ultra-fine particle removal or medical-grade filtration should look elsewhere, and customers with unusually sized filter slots should verify the actual dimensions (20.50 in x 21.50 in x 0.75 in) before purchasing because some buyers report mixed experiences with size fit.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures a large portion of dust and pet allergens with \u003cstrong\u003eMERV 11\u003c\/strong\u003e media while maintaining good airflow.\u003c\/li\u003e\n\u003cli\u003eLasts longer than fiberglass alternatives thanks to electrostatic pleats and 14 pleats per ft.\u003c\/li\u003e\n\u003cli\u003eSturdy beverage board frame with dual wire backing improves durability through temperature swings.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eActual dimensions are 20.50 in x 21.50 in x 0.75 in, and some users report the size can be slightly unexpected, so check your slot before buying.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eFilterbuy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel size\u003c\/td\u003e\n\u003ctd\u003e21x22x1 (actual 20.50 in x 21.50 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 11 (comparable to MPR 1200 \u0026amp; FPR 7)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMedia\u003c\/td\u003e\n\u003ctd\u003eElectrostatically charged synthetic pleated media\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\u003eFrame\u003c\/td\u003e\n\u003ctd\u003eBeverage board with dual wire backing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eMade in the USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Filterbuy 21x22x1 MERV 11 two-pack is a practical choice for most homes with pets or allergy sensitivities, providing improved filtration and a durable frame at a reasonable price. It balances capture efficiency with good airflow and holds up better than basic cardboard-framed fiberglass filters, making it a worthwhile routine replacement for standard residential HVAC systems.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eHow often should these be replaced?\u003c\/strong\u003e\u003cbr\u003eReplace every 90 days for best results, though households with heavy pet hair or high dust may need to replace more frequently.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill a MERV 11 filter restrict my airflow?\u003c\/strong\u003e\u003cbr\u003eMERV 11 captures finer particles but is designed to avoid major restriction in typical home HVAC systems; confirm compatibility with your system if it is older or has limited fan capacity.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo these filters fit exactly at 21x22x1?\u003c\/strong\u003e\u003cbr\u003eThe nominal size is 21x22x1 but the actual filter measures 20.50 in x 21.50 in x 0.75 in, so check your filter slot to ensure a proper fit.\u003c\/p\u003e","brand":"Filterbuy","offers":[{"title":"Default Title","offer_id":48620072829147,"sku":"B00CK02Q28","price":49.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81jc6kpuWNL._AC_SL1500_c5500521-ada7-4001-b8c3-38c04ee63e89.jpg?v=1778498974","url":"https:\/\/gearmusthave.com\/products\/filterbuy-21x22x1-air-filter-merv-11-superior-pet-allergy-defense","provider":"GearMustHave","version":"1.0","type":"link"}