Through-the-wall ventilator can be installed in outside walls from 5-1/4 inches to 10 inches thick. Quick, easy installation. Includes polymeric interior grille, exterior louvered wall cap, fan, flexible aluminum ducting, and built-in bird screen. Housing 6-inch diameter, grill 8-inch diameter. 70 CFM (cubic feet per minute), UL (Underwriter's Laboratories) listed.