About This Carbon MERV8 FILTER: This is a Carbon MERV 8 rated 4 pack Air Conditioner Filter | Size: 12" x 26" x 1" - Actual Size: 11.5" x 25.5" x .75" MADE IN USA: Fully manufactured in the United States. Made from the highest quality materials and construction. (EPA Establishment Number: 103501-FL-1) MAX PERFORMANCE: Our filters can last up to 90 DAYS before needing replacement. We do recommend to change your home air filter every 30 - 90 days for 1 inch filters. This will help maintain the longevity of the intended application like A/C and heaters CAPTURE MORE: Protect your home! The pleated design captures more particles and extends lifetime of the filter. Merv Filters trap airborne particles without impacting air flow. Feel the difference in 48 hours. Overview Brand : Filter King Product Dimensions : 11.5"L x 25.5"W x 0.75"Th Compatible Devices : Air Conditioner, Furnace UPC : 645637574830 Number of Items : 4 Manufacturer : Filter King Unit Count : 4.0 Count