Nordic Pure 18x24x2M12-3 MERV 12 Pleated Air Condition Furnace Filter, Box of 3 Actual size: 17 3/8 x 23 3/8 x 1 3/4 Superior Air Filter for Residential or Commercial Property Comparable to a MPR rating of 1500-1963 Hypoallergenic and antimicrobial pleated electrostatic filter material Made in the USA