FILTER: This is a MERV 8 rated 4 pack Air Conditioner Filter | Size: 11 x 11 x 1 - Actual Size: 11 x 11 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. FAST & EASY INSTALLATION: Open, Slide and Close! A simple yet effective replacement air filter for your home. ASIN B0CPT9G2DP Brand Name Filter King Unit Count 4.0 Count MERV Rating 8 Filter Shape Square Manufacturer Filter King Model Number FK11x11x1A-M8-4 Material Type Polypropylene Product Grade new Number of Items 4 Compatible Devices Air Conditioner, Furnace Common Applications Residential Filter Mounting Type Slide In Warranty Description No Applicable Warranty Air Filter Construction Pleated Manufacturer Part Number FK11x11x1A-M8-4 Item Dimensions L x W x Thickness 11 L x 11 W x 0.75 Th Global Trade Identification Number 00023688217775 EU Spare Part Availability Duration 90 Days