{"product_id":"filtrete-allergen-defense-18-in-w-x-20-in-h-x-1-in-polypropylene-11-merv-pleated-air-filter","title":"Filtrete Allergen Defense 18 in. W X 20 in. H X 1 in. Polypropylene 11 MERV Pleated Air Filter","description":"\u003cdiv\u003e\n\u003cp\u003eUpgrade your indoor air with the Filtrete Allergen Defense 18x20x1 MERV 11 Pleated Air Filter. Crafted with electrostatic polypropylene media and a durable pleated design, this filter is engineered to capture a wide range of airborne irritants while preserving strong airflow through your HVAC system.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eKey benefits that matter\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003e11 MERV filtration\u003c\/strong\u003e targets fine particles, reducing pollen, dust, mold spores, and smoke so you breathe easier.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eElectrostatic media\u003c\/strong\u003e enhances particle attraction for more efficient capture without restricting airflow.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePleated polypropylene construction\u003c\/strong\u003e provides a larger filtration surface area, trapping more contaminants in each pass.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBacteria filtration\u003c\/strong\u003e helps reduce microbial presence in the conditioned space, contributing to a cleaner environment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSmoke filtration\u003c\/strong\u003e supports better air quality in homes exposed to tobacco smoke or smoke-related particles.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePollutants covered\u003c\/strong\u003e captures dust, lint, pollen, mold spores, and other common irritants, while noting that viruses are not filtered by this model.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFit and size\u003c\/strong\u003e designed for standard 18x20x1 filter slots; nominal size 18x20x1 with actual dimensions around 17-3\/4 x 19-3\/4 x 3\/4 for precise fit in compatible frames.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWho benefits most\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eAllergy sufferers and households dealing with seasonal pollen, pet dander, or dust.\u003c\/li\u003e \u003cli\u003eSmoky environments looking to reduce smoke particles in the living space.\u003c\/li\u003e \u003cli\u003eHomes with central HVAC systems that require a reliable 18x20x1 filter to maintain airflow and air quality.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this Filtrete filter stands out\u003c\/h3\u003e\n\u003cp\u003eCompared with standard fiberglass or non-electrostatic filters, the Filtrete Allergen Defense combines electrostatic filtration with a high-efficiency MERV 11 rating to deliver more effective contaminant capture without overly restricting airflow. Its durable polypropylene media is pleated for longevity and better surface area, helping your system run efficiently while delivering cleaner air.\u003c\/p\u003e \u003ch3\u003ePractical insights and tips\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eFor best results, ensure the filter is properly seated in the frame to prevent bypass of unfiltered air.\u003c\/li\u003e \u003cli\u003eUse in spaces where air quality is a priority—bedrooms, living rooms, and busy common areas can especially benefit.\u003c\/li\u003e \u003cli\u003eIf you notice reduced airflow or visible buildup, consider replacing the filter to maintain filtration efficiency and system performance.\u003c\/li\u003e \u003cli\u003eKeep a spare on hand and verify the nominal vs. actual dimensions to confirm a snug fit in your 18x20x1 slot.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Filtrete","offers":[{"title":"Default Title","offer_id":52169058550034,"sku":"4027971","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0928\/1024\/8466\/files\/4027971_A.eps_High.jpg?v=1775414631","url":"https:\/\/nationalhardwaregroup.com\/products\/filtrete-allergen-defense-18-in-w-x-20-in-h-x-1-in-polypropylene-11-merv-pleated-air-filter","provider":"National Hardware Group","version":"1.0","type":"link"}