{"title":"All 4-Inch Air Filters","description":"\u003cp\u003e \u003c\/p\u003e\n\u003ch2 class=\"size-landing-description h2\"\u003e4-Inch HVAC \u0026amp; Furnace Filters\u003c\/h2\u003e\n\u003cdiv class=\"size-landing-header-container col-md-6\"\u003e\n\u003cp\u003eWhen it's time to replace your 4-inch filters, avoid paying for international sourcing and shipping fees by choosing 4-inch air filters from Factory Direct Filters. Each of our products is made in America and manufactured in our own facilities, allowing us to offer you the best price in the market. Our 4-inch furnace filters come in every size, from standard 14x4 air filters to custom measurements you can't find at the big box stores.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eRemove Allergens, Dust, \u0026amp; More with 4\" Air Filters\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eDepending on the MERV rating you choose, your 4-inch AC filter can capture and remove a wide variety of debris in your office or residential property. After selecting the measurements you need, choose your filtration efficiency and optimal air quality with your preferred MERV rating. If you aren't convinced, check out a few of the features that make our 4-inch air filters exceptional:\u003c\/p\u003e\n\u003cul class=\"size-landing-description\"\u003e\n\u003cli\u003eAvailable in all sizes\u003c\/li\u003e\n\u003cli\u003eLowest prices and free shipping\u003c\/li\u003e\n\u003cli\u003eCan reduce energy costs by up to 15%\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eOpportunity to enhance the quality of your air with a higher MERV rating\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"size-landing-description\"\u003e\u003c\/ul\u003e\n\u003cp\u003eGet free shipping and high filtration efficiency with our 4-inch air filters!\u003c\/p\u003e\n\u003cp\u003eSelect your specific 4-inch filter measurements below or \u003ca href=\"https:\/\/www.factorydirectfilters.com\/custom-filters\" title=\"custom sizes\" target=\"_blank\"\u003ecreate your own custom size\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"10x10x4-aerostar-air-filter","title":"10x10x4 Aerostar Air Filter","description":"These 10x10x4 air filters are right-sized for your needs. 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Lennox whole-house media filter housings run on a 4-inch slot, and the Lennox-branded refill through a dealer is substantially more expensive than this Aerostar equivalent, with the same pleated media construction and the same dimensional fit. MERV 8 covers baseline residential filtration: dust, lint, pollen. MERV 11 handles pet households and mild allergy concerns. MERV 13 captures fine particulates including bacteria, virus-carrying droplets, and wildfire smoke - the recommended grade for households with respiratory health issues. The 4-inch depth is what makes this filter outlast 1-inch alternatives by a wide margin: substantially more media in the filter equals more capacity before pressure drop becomes the limit. Service life is 6 to 12 months in typical residential conditions. Pleated synthetic electrostatic media handles the work, manufactured by Con-Air Industries at the Orlando, Florida facility. Cardboard frame, reinforced for the airflow rates Lennox whole-house systems generate. 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