AeroStar 20x24x4 Commercial & Residential Air Filter

The 20x24x4 Aerostar fits commercial and residential systems with a 4-inch filter slot, measuring 19 3/8" x 23 3/8" x 3 3/4" actual. The 4-inch depth is where pleated filtration earns its cost: substantially more media than a 1-inch can hold, much lower pressure drop across the filter face, and a service life measured in months rather than weeks. MERV 8 covers baseline residential and light commercial filtration. MERV 11 handles pet households and most allergen concerns. MERV 13 captures fine pa