AeroStar 20x22 1/4x1 Air Filter
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The 20 x 22 1/4 x 1 Aerostar comes in at an actual 19 7/8" x 22 1/4" x 3/4", built for a nominal 20 x 22 1/4 x 1 return. Odd-sized returns in this dimension show up in custom builds and certain regional markets where the original installer specified a non-standard grille opening. MERV 8 covers baseline residential filtration. MERV 11 captures pet dander, smoke residue, and most common allergens. MERV 13 handles fine particulates including bacteria, virus carriers, and wildfire smoke - the grade
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