Nordic Pure 18x22x1CustomM7-6 MERV 7 AC Furnace Filters, 6 Piece Actual Size: 17 1/2 x 21 1/2 x 3/4 (17.5x21.5x0.75) Measure your current filter and compare the exact Dimensions with the ACTUAL size listed above before you order MERV 7 media is ideal for normal air filtration and will help those with mild allergies Hypoallergenic and antimicrobial pleated electrostatic filter material Made in the USA