VENTS-US 4 in. Galvanized Back-Draft Damper with Rubber Seal KOM 100 U - The Home Depot
GVD-4PL - Field Controls GVD-4PL - 4" Automatic GVD Vent Damper, without harness
Duct & Dampers — Rega Vent
Manual AIR BALANCE Duct Damper | Oval Regulator
Galvanized Wall Vent With Spring-Loaded Damper, Gasket, Screen
Master Flow 8 in. Inline Damper ILD8 - The Home Depot
Aluminum ventilation damper - UL - TROX
Gas Vent Dampers, GVD Models - Field Controls
Master Flow 7 in. x 7 in. Butterfly Damper BDD7 - The Home Depot
Ventilation Damper And Ventilation Actuators | Alnor
Amazon.com: MIVIDE 2Pack 4 Inch Backdraft Damper, Backflow Shutter Damper, Inline Fan Vent Deflector with Spring-Loaded Folding Blades for Ducting in Range Hoods, Bathrooms Fans and Kitchen Fan : Tools & Home
GVD-7PL - Field Controls GVD-7PL - 7" Automatic GVD Vent Damper, without harness
Floor vent dampers, floor register damper, metal damper
110mm PPS Ventilation Damper Unit | Ducting | Fume