The product is a 19.875x21.5x1 MERV 8 air filter designed to remove mold, pollen, dust, and lint. It is compatible with air conditioners and furnaces, specifically the Inventor Chilly 9000BTU model. Made of synthetic material, this filter is lightweight at 1.1 pounds and comes in a pack of four. With a specific dimension of 21.5"L x 19.88"W x 0.75"Th, this filter is essential for maintaining indoor air quality and ensuring a comfortable living environment. Nominal size: 19 7/8x21 1/2x1; Actual size: 19 7/8"x21 1/2"x3/4"; This MERV 8 filter is comparable with MPR 600 FPR 5 Designed to filter microscopic particles such as lint, dust mites, spores, and pollen Simple to install and a cost-effective step towards a healthier home environment. For best results, change your filters every 60 to 90 days but increase frequency to 30 days during peak summer and winter months 100% synthetic electrostatic media for high efficiency with low air flow resistance Manufactured by Filtration Group, a world-leading manufacturer and supplier of filtration solutions making the world safer, healthier more productive