EcoPlus Ducting Dampers
These are excellent quality back draft dampers. They are made from heavy-gauge galvanized steel with heavy duty springs. They use both an embossed bead & rubber gasket to help keep ducting securely in place. They prevent back draft air when your fans are off.
— Ships from SS: WA, CA, CO, MI, TN, PA, FL USA (not via USPS).