{"title":"4 Inch Air Filters","description":"\u003ch2 class=\"size-landing-description h2\"\u003eBuy 4 Inch Air Filters \u0026amp; Replacement Filters Online\u003c\/h2\u003e\n\u003cdiv class=\"size-landing-header-container col-md-6\"\u003e\n\u003cp\u003eFreshen the air in your home or office with our 4 inch air filters. With standard, hard-to-find, and custom sizes available, we know you'll find exactly what you need to improve your air quality. As you increase the MERV rating of your 4 inch furnace filter, the filtration efficiency also increases. Choose the rating that is right for you and best accommodates your individual needs or preferences.\u003c\/p\u003e\n\u003cp\u003eOur 4 inch filters offer the following features:\u003c\/p\u003e\n\u003cul class=\"size-landing-description\"\u003e\n\u003cli\u003eA Variety of Sizes, Including Standard 14x4 Air Filters \u0026amp; Custom Options\u003c\/li\u003e\n\u003cli\u003eSuperior, Made-in-the-USA Quality\u003c\/li\u003e\n\u003cli\u003eLower Price than You'll Find Anywhere Else\u003c\/li\u003e\n\u003cli\u003e4 MERV Ratings for Enhanced Filtration Efficiency\u003c\/li\u003e\n\u003cli\u003e4\" Air Filters That Can Reduce Your Energy Costs By Up To 15%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"size-landing-description\"\u003e\u003c\/ul\u003e\n\u003cp\u003eChoose your 4 inch air filter from below or\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"\/pages\/create-custom-air-filter\"\u003eshop extended sizes.\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"16x25x4-lenox-deep-pleat-air-filter","title":"16x25x4 - Lenox Deep Pleat Air Filter by Aerostar","description":"The 16x25x4 Aerostar is designed as a replacement for Lennox deep-pleat air filter cabinets, sized at an actual 15 1\/2\" x 24 1\/2\" x 4 1\/4\". 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. If your Lennox has a static-pressure-monitoring port, use it to verify filter performance across the service life - climbing static pressure is the actual change indicator regardless of how long the filter has been in service.","brand":"Lenox","offers":[{"title":"MERV 8 \/ 6","offer_id":41902550548634,"sku":"RDP.LX041625M08-6","price":194.99,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 2","offer_id":41902550384794,"sku":"RDP.LX041625M11-2","price":79.99,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 2","offer_id":41902550417562,"sku":"RDP.LX041625M13-2","price":82.99,"currency_code":"USD","in_stock":true},{"title":"MERV 8 \/ 4","offer_id":41902550450330,"sku":"RDP.LX041625M08-4","price":143.99,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 4","offer_id":41902550483098,"sku":"RDP.LX041625M11-4","price":143.99,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 4","offer_id":41902550515866,"sku":"RDP.LX041625M13-4","price":141.99,"currency_code":"USD","in_stock":true},{"title":"MERV 8 \/ 2","offer_id":41902550352026,"sku":"RDP.LX041625M08-2","price":79.99,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 6","offer_id":41902550581402,"sku":"RDP.LX041625M11-6","price":194.99,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 6","offer_id":41902550614170,"sku":"RDP.LX041625M13-6","price":181.99,"currency_code":"USD","in_stock":true},{"title":"MERV 8 \/ 12","offer_id":41902550646938,"sku":"RDP.LX041625M08-12","price":350.99,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 12","offer_id":41902550679706,"sku":"RDP.LX041625M11-12","price":370.99,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 12","offer_id":41902550712474,"sku":"RDP.LX041625M13-12","price":309.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0591\/6937\/4362\/files\/16x25x4_LX_MERV8_1pk.png?v=1790022137"},{"product_id":"16x20x4-commercial-hvac-filter","title":"16x20x4 Commercial \u0026 Residential Aerostar Air Filter","description":"A 16x20x4 fits a deep return cabinet - usually a media filter housing like an Aprilaire, Honeywell, or similar whole-house setup. This Aerostar measures 15 1\/2\" x 19 1\/2\" x 3 3\/4\" actual, sized for both commercial and residential applications. The 4-inch depth is where 1-inch filters can't compete: substantially more pleated media, much lower pressure drop, and a service life measured in months rather than weeks. Three MERV grades cover the typical range. MERV 8 for baseline household and light commercial use. MERV 11 for pet households or environments with elevated particulate loads. MERV 13 for fine particulate filtration including smoke, bacteria, and virus-sized aerosols. Run MERV 13 in light commercial spaces handling food prep, healthcare, or anywhere indoor air quality matters more than minimal cost. Pleated synthetic media with an electrostatic charge does the work; the cardboard frame is reinforced to hold up under the higher airflow rates typical of commercial blowers. Manufactured by Con-Air Industries in Orlando, Florida. Service life on a 4-inch filter runs 6 to 12 months in residential use, 3 to 6 months in light commercial applications. Pressure drop is the limiting factor more than time itself - if your system gauge shows climbing static pressure, that's the change signal.","brand":"Aerostar","offers":[{"title":"MERV 8 \/ 6","offer_id":41902783365274,"sku":"P80S.041620-6","price":103.99,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 2","offer_id":41902783201434,"sku":"P15S.041620-2","price":55.99,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 2","offer_id":41902783234202,"sku":"P25S.041620-2","price":55.99,"currency_code":"USD","in_stock":true},{"title":"MERV 8 \/ 4","offer_id":41902783266970,"sku":"P80S.041620-4","price":87.99,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 4","offer_id":41902783299738,"sku":"P15S.041620-4","price":89.99,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 4","offer_id":41902783332506,"sku":"P25S.041620-4","price":94.99,"currency_code":"USD","in_stock":true},{"title":"MERV 8 \/ 2","offer_id":41902783168666,"sku":"P80S.041620-2","price":54.99,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 6","offer_id":41902783398042,"sku":"P15S.041620-6","price":112.99,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 6","offer_id":41902783430810,"sku":"P25S.041620-6","price":122.99,"currency_code":"USD","in_stock":true},{"title":"MERV 8 \/ 12","offer_id":41902783463578,"sku":"P80S.041620-12","price":187.99,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 12","offer_id":41902783496346,"sku":"P15S.041620-12","price":212.99,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 12","offer_id":41902783529114,"sku":"P25S.041620-12","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0591\/6937\/4362\/files\/16x20x4_MERV8_1pk.png?v=1790519041"},{"product_id":"16x24x4-commercial-hvac-filter","title":"16x24x4 Commercial \u0026 Residential Aerostar Air Filter","description":"The Aerostar 16x24x4 commercial HVAC air filter is ready to filter the air in your home or office. Choose the MERV rating that suits your lifestyle and start filtering cleaner air through your air conditioning or furnace system.","brand":"Aerostar","offers":[{"title":"MERV 8 \/ 6","offer_id":41902785069210,"sku":"P80S.041624-6","price":179.99,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 2","offer_id":41902784905370,"sku":"P15S.041624-2","price":84.99,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 2","offer_id":41902784938138,"sku":"P25S.041624-2","price":99.99,"currency_code":"USD","in_stock":true},{"title":"MERV 8 \/ 4","offer_id":41902784970906,"sku":"P80S.041624-4","price":119.99,"currency_code":"USD","in_stock":false},{"title":"MERV 11 \/ 4","offer_id":41902785003674,"sku":"P15S.041624-4","price":164.99,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 4","offer_id":41902785036442,"sku":"P25S.041624-4","price":193.99,"currency_code":"USD","in_stock":true},{"title":"MERV 8 \/ 2","offer_id":41902784872602,"sku":"P80S.041624-2","price":68.6,"currency_code":"USD","in_stock":false},{"title":"MERV 11 \/ 6","offer_id":41902785101978,"sku":"P15S.041624-6","price":240.99,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 6","offer_id":41902785134746,"sku":"P25S.041624-6","price":282.99,"currency_code":"USD","in_stock":true},{"title":"MERV 8 \/ 12","offer_id":41902785167514,"sku":"P80S.041624-12","price":339.99,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 12","offer_id":41902785200282,"sku":"P15S.041624-12","price":467.99,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 12","offer_id":41902785233050,"sku":"P25S.041624-12","price":549.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0591\/6937\/4362\/files\/16x24x4_MERV8_1pk.png?v=1790042091"},{"product_id":"16x25x4-commercial-hvac-filter","title":"16x25x4 Commercial \u0026 Residential Aerostar Air Filter by Aerostar","description":"The Aerostar 16x25x4 commercial HVAC air filter is ready to filter the air in your home or office. Choose the MERV rating that suits your lifestyle and start filtering cleaner air through your air conditioning or furnace system.","brand":"Aerostar","offers":[{"title":"MERV 8 \/ 2","offer_id":41902786576538,"sku":"P80S.041625-2","price":47.97,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 2","offer_id":41902786609306,"sku":"P15S.041625-2","price":54.97,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 2","offer_id":41902786642074,"sku":"P25S.041625-2","price":64.97,"currency_code":"USD","in_stock":true},{"title":"MERV 8 \/ 4","offer_id":41902786674842,"sku":"P80S.041625-4","price":79.97,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 4","offer_id":41902786707610,"sku":"P15S.041625-4","price":89.97,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 4","offer_id":41902786740378,"sku":"P25S.041625-4","price":109.97,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 6","offer_id":41902786805914,"sku":"P15S.041625-6","price":129.97,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 6","offer_id":41902786838682,"sku":"P25S.041625-6","price":146.97,"currency_code":"USD","in_stock":true},{"title":"MERV 8 \/ 12","offer_id":41902786871450,"sku":"P80S.041625-12","price":199.97,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 12","offer_id":41902786904218,"sku":"P15S.041625-12","price":242.97,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 12","offer_id":41902786936986,"sku":"P25S.041625-12","price":262.97,"currency_code":"USD","in_stock":true},{"title":"MERV 8 \/ 6","offer_id":41902786773146,"sku":"P80S.041625-6","price":119.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0591\/6937\/4362\/files\/16x25x4_MERV8_1pk.png?v=1790229947"},{"product_id":"18x24x4-commercial-hvac-filter","title":"18x24x4 Commercial \u0026 Residential Aerostar Air Filter","description":"The Aerostar 18x24x4 commercial HVAC air filter is ready to filter the air in your home or office. 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The 4-inch depth is where pleated filtration earns its cost: substantially more media than a 1-inch can hold, much lower pressure drop across the filter face, and a service life measured in months rather than weeks. MERV 8 covers baseline residential and light commercial filtration. MERV 11 handles pet households and most allergen concerns. MERV 13 captures fine particulates including smoke, bacteria, and virus-sized droplets - the recommended grade for healthcare, food service, or any indoor environment where air quality matters more than minimal cost. The cardboard frame is reinforced for the higher airflow rates commercial blowers generate, which can collapse weaker filter frames. Pleated synthetic media with an electrostatic charge handles the work, manufactured by Con-Air Industries in Orlando, Florida. Service life is 6 to 12 months in residential use, 3 to 6 months in light commercial applications. 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