ECOPLUSŪ BACKDRAFT DUCTING DAMPER - 8"
ECOPLUSŪ BACKDRAFT DUCTING DAMPER - 8" at HorticultureSource.com -
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.