Air Filter, True Blue Allergen, 20X25X1, Merv 11, 4-Pack. Product Description True Blue Allergen Air Filters have a MERV 11 rating. The filters are electrostatically charged material traps dust, dander, pollen and other allergen particles for healthier breathing. For more air protection, synthetic construction resists bacteria and mold growth. From the Manufacturer The True Blue Allergen air filter is specifically designed for families with allergies and pets. It is 53 times more effective than fiberglass filters and will last up to 4 months. During the manufacturing process, we charge the filter media with an electric current. This process allows the filter to attract very small particles much the same way magnets attract metal. The end result is a far more effective filter. The electrostatically charged filter media filters sub-micron airborne allergens like dust, dirt, pollen, pet dander, dust mite debris, microscopic allergens, smoke and smog. 100% Synthetic filter media will not support the growth of bacteria, mold, or fungi in normal use. Product Features 20 x 25 x 1 Pleated air filter Filters sub-micron airborne allergens like dust, dirt, pollen, pet dander, dust mite debris, microscopic allergens, smoke and smog Performance allergen reduction filter Lasts up to 120 days Minimum efficiency reporting value or MERV rating is 11 Filter is made of a synthetic material for resistance to growth of bacteria, fungi and mold. Cardboard frame. Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!