Nordic Pure 18x22x1CustomM12+C-6 MERV 12 + Carbon 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 12 Plus Carbon media is ideal for high efficiency air filtration. These filters control voc's, odors and will help those with moderate allergies and asthma Hypoallergenic and antimicrobial pleated electrostatic filter material Made in the USA