AeroStar 18x24x2 Air Filter

The 18x24x2 Aerostar comes in at 17 3/8" x 23 3/8" x 1 3/4" actual. Built for a nominal 18x24x2 return, which is a common spec on older residential furnaces and many light commercial air handlers. The 2-inch depth gives you roughly twice the debris-holding capacity of a 1-inch filter in the same nominal opening, and the lower pressure drop is easier on the blower motor across its service life. MERV 8 covers standard residential dust and pollen filtration. MERV 11 handles pet dander and most comm