Elevate your home's ventilation system with the Master Flow Replacement Shutter (Model S24). This aluminum-constructed replacement is designed specifically for the GAF Master Flow 24 in. Direct Drive Whole House Fan (WHFS24M). Presented in a clean White finish, this "Used - Great" condition shutter is close to new, with only light cosmetic imperfections, and is ready for easy installation (hardware not included). The gravity louvers open automatically when the unit runs and close when it shuts off, providing efficient and automatic operation. Product dimensions are approximately: Width: 27.25 in, Depth: 28.25 in, Height: 2 in, and it weighs 7 lbs. This HVAC accessory is currently priced at $127.65.