Nordic Pure 21x23x1ExactCustomM10-6 MERV 10 AC Furnace Filters, 6 Piece Actual Size: 21 x 23 x 3/4 Exact (21x23x0.75) This item is made to the exact size listed above. Please measure your current filter and compare sizes before you order MERV 10 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