{"product_id":"filtrete-20x20x4-ac-furnace-air-filter-mpr-1000-merv-11-allergen","title":"Filtrete 20x20x4 AC Furnace Air Filter MPR 1000 MERV 11 - Allergen","description":"\u003cp\u003eIn this review the Filtrete 20x20x4 AC Furnace Air Filter is evaluated for homeowners and renters who want a simple, year-long solution to reduce household allergens. The bottom line: it is a practical choice for systems that accept a 4 in filter and for anyone prioritizing particle capture without complex installation. The pack of two and the \u003cstrong\u003eMPR 1000\u003c\/strong\u003e plus \u003cstrong\u003eMERV 11\u003c\/strong\u003e ratings mean it pulls in a wide range of microparticles and larger debris, making it a straightforward upgrade if you want cleaner indoor air with a single annual filter change.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExact dimensions:\u003c\/strong\u003e The filter measures 19.88 in x 19.88 in x 4.31 in so buyers know the true size rather than a nominal label.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParticle capture:\u003c\/strong\u003e MPR 1000 and MERV 11 ratings help trap fine particles like pet dander, smoke and smog while still allowing airflow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree-in-one technology:\u003c\/strong\u003e Filtrete 3-in-1 electrostatic design pulls in and holds a variety of microparticles for fresher indoor air.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertified for allergies:\u003c\/strong\u003e This filter is certified as asthma and allergy-friendly, which gives extra confidence for sensitive households.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-pack convenience:\u003c\/strong\u003e Sold as a 2-pack of 12-month filters so you get a full year of coverage and a spare for timely replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmart reminders:\u003c\/strong\u003e Use the Filtrete Smart App to set 90-, 180- or 365-day reminders so you change the filter on schedule.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe Filtrete 20x20x4 is best for homeowners or renters with HVAC systems or furnaces that accept a 4.31 in thick filter and who want one annual maintenance cycle rather than frequent swaps. It suits households with pets or where smoke and urban smog make fine particle capture a priority, and the allergy certification makes it a sensible choice for those with sensitivities.\u003c\/p\u003e\u003cp\u003ePeople who should look elsewhere include owners of systems that require an exact nominal 20x20x4 fit but have limited clearance, since some customers reported mixed fit results. Also, if you need monthly or quarterly high-flow, ultra-high-efficiency filtration for specialized environments, a different product may be more appropriate.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGood particle capture from \u003cstrong\u003eMPR 1000\u003c\/strong\u003e and \u003cstrong\u003eMERV 11\u003c\/strong\u003e performance for household allergens and fine particulates.\u003c\/li\u003e\n\u003cli\u003eTwo-pack provides value and a spare for the year, making replacements simple.\u003c\/li\u003e\n\u003cli\u003eCertified asthma and allergy-friendly, useful for sensitive occupants.\u003c\/li\u003e\n\u003cli\u003eSmart App compatibility for easy change reminders.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExact size 19.88 in x 19.88 in x 4.31 in can be slightly different from nominal 20x20x4 openings; some systems may have a tight fit.\u003c\/li\u003e\n\u003cli\u003eDesigned for annual replacement; households wanting more frequent high-flow changes may prefer thinner filters changed more often.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eFiltrete (3M)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual size\u003c\/td\u003e\n\u003ctd\u003e19.88 in x 19.88 in x 4.31 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack\u003c\/td\u003e\n\u003ctd\u003e2-pack, 12-month filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParticle rating\u003c\/td\u003e\n\u003ctd\u003eMPR 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMERV rating\u003c\/td\u003e\n\u003ctd\u003eMERV 11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertification\u003c\/td\u003e\n\u003ctd\u003eAsthma and allergy-friendly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesigned to fit\u003c\/td\u003e\n\u003ctd\u003eHoneywell brand media air cleaners and systems accepting 4.31 in filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Filtrete 20x20x4 MPR 1000 filter is a smart, cost-effective choice for most homes needing improved allergen and fine-particle capture without complicated maintenance. Its true dimensions, certified allergy-friendly design and two-pack value make it a practical annual solution, provided the system has clearance for the 4.31 in thickness.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWill this fit a nominal 20x20x4 slot?\u003c\/strong\u003e\u003cbr\u003eIt measures 19.88 in x 19.88 in x 4.31 in, so it fits many systems calling for 20x20x4 but may be tight in enclosures with minimal clearance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow often should I change the filter?\u003c\/strong\u003e\u003cbr\u003eChange it at least once every 12 months for optimal performance; the two-pack gives you a spare year of coverage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this reduce pet dander and smoke?\u003c\/strong\u003e\u003cbr\u003eYes, the \u003cstrong\u003eMPR 1000\u003c\/strong\u003e and \u003cstrong\u003eMERV 11\u003c\/strong\u003e ratings and Filtrete 3-in-1 technology help capture pet dander, smoke and other fine particles.\u003c\/p\u003e","brand":"Filtrete","offers":[{"title":"Default Title","offer_id":48204025954523,"sku":"B09RQBH847","price":58.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61zTyrpwxtL._AC_SL1280.jpg?v=1770226765","url":"https:\/\/gearmusthave.com\/products\/filtrete-20x20x4-ac-furnace-air-filter-mpr-1000-merv-11-allergen","provider":"GearMustHave","version":"1.0","type":"link"}