AeroStar 24x24x4 Commercial & Residential Air Filter

The 24x24x4 Aerostar measures 23 3/8" x 23 3/8" x 3 3/4" actual, sized for both commercial and residential applications with a 4-inch filter slot. Square 24x24 returns in this depth are common spec on commercial rooftop units and certain residential whole-house media housings. The 4-inch depth is where pleated filtration earns its position: substantially more media than a 1-inch holds, much lower pressure drop, and service life measured in months rather than weeks. MERV 8 covers baseline commerc