Nominal Size: 18 x 30 x 1, Actual Size: 17 3/4"x29 3/4"x3/4",Comparable with MPR 1500-1900 & FPR 10,Designed to filter microscopic particles such as lint, dust mites, spores, pollen, pet dander, fine dust, smoke, and bacteria.,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 in the USA by Filtration Group, a world-leading manufacturer and supplier of filtration solutions making the world safer, healthier & more productive