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6 Pack of 20x25x4 MERV 11 Pleated 4″ Inch Air Filters for AC & Furnace by Glasfloss. Actual Size: 19-1/2 x 24-1/2 x 3-3/4 ● Filtration Rating: MERV 11. Comparable to 3M/Filtrete MPR rating 1000 to 1200, or FPR rating 7. ● Effectively reduces pollen, dust, pet dander, mold spores, dust mites, bacteria, smoke, smog and other allergens from the air in your home or business. ● Note: Does not replace 5″ inch or 4-3/8″ Depth filters. Please check actual filter size needed. ● The 4 inch Glasfloss MERV 11 pleated allergen reduction electrostatic air filter will enhance the air quality in your home or business. This electrostatic air filter attracts and captures airborne dust, pollen, mold spores, pet dander, smog, dust mite debris, and baking flour. The Glasfloss Z-Line Series pleated filters offer improved performance for virtually every application. All Glasfloss Z-Line pleated filters feature fibers which do not absorb moisture and will not support microbial growth. The Glasfloss Z-Line Series filters achieve a MERV 11 rating per the ANSI/ASHRAE 52.2 Test Standard. The Z-Line Series pleat is available in many standard face dimensions in 1”, 2″ and 4″ depths. Glasfloss Z-Line Series pleated filters incorporate media which is laminated to a galvanized metal that stabilizes the media during operation. The pleats are formed in a radial configuration to ensure proper dust-loading. The standard pleated cartridge is bonded into a two-piece heavy-duty beverage board die-cut frame that creates a double-wall thickness around the filter and prevents air bypass. The die-cut grilles are internally bonded to the pleat apexes on the air-entry and air-exit sides to ensure maximum integrity and support during the life of the filter. Glasfloss Z-Line Series pleated filters are used in a broad range of installations, from pre-filters to primary filters for computer room units. Whether used as primary filters or as pre-filters in multi-stage systems, Glasfloss Z-Line Series pleated filters offer a solution for virtually every residential, commercial, and industrial HVAC application. Free shipping, really?We always provide free shipping, and free shipping on returns. You dont even have to ask us, just expect it! How do you ship, and how long will it take to receive my order?We ship USPS Priority Mail, FedEx Ground, and FedEx Smart Post. We ship orders out fast, either the same day or next business day, depending on what time the order is placed. Your order is carefully packaged and is shipped from North Carolina. Shipping time to the Eastern part of the United States takes 1-4 days, Midwest takes 3-4 days, and the West Coast usually takes 4-7 days to arrive. We only ship in the continental United States, which means only the lower 48 states, and not to HI, AK, Puerto Rico or International. What do you mean by 100% Customer Satisfaction policy?Its true, we mean it. We want our customers to be 100% happy with doing business with us and we will do almost anything to make it right. If you are not happy with the product for any reason, please let us know and we?ll issue a free return label to send back the order for a full refund. We do returns with a smile and sincere appreciation for giving us the opportunity to earn your business. What if I have to return my order?We make returns so easy, just contact us and log into your eBay account and click the return order link in the completed orders section. We will cheerfully email you a free shipping label to send the order back at your convenience for a full refund. We have a no-hassle return policy. Please try and let us know before 90 days if you need to return the order. When can I expect a refund?We issue ebay refunds on returns the same day when the returned order is received, or if we can confirm the returned shipment by checking the tracking. Our goal is to refund your money as fast as possible. Once we issue a refund thru ebay, it generally takes your bank 4-8 days to put the funds back on your card. We will always be fair and do right with our customers!