Heavy Duty Twin Backdraft Damper Wall Shutter For Hvac Ductwork Galvanized Steel Self Closing Opener Stops Cold Air Seep Back Into House Secure Mount For Garage Or Basement Ventilation Setup

Twin Backdraft Damper Shutter For hv ducts And Vent Sets
✔️ Galvanized housing, 315mm fit, Gravity drop flaps, PVC shock pad seal

This twin direct connection backdraft shutter keeps outdoor drafts from sneaking inside when your exhaust fan shuts off. You can easily mount it over the pipe lip on walls in garages, basements, bathrooms, or any room that needs steady airflow without worrying about corrosion thanks to the sturdy metal build.

✅ Galvanized steel housing fitted with 315 mm or 12.4 inch aluminum blades
✅ Off-white epoxy finish stops rust while keeping the unit light
✅ Shock absorbing PVC foam ring kills flap noise during operation
✅ Gravity drop design handles residential AC vents and commercial exhaust systems

💡 What makes a twin blade backdraft shutter handy for stopping unwanted drafts in hvac ductwork?
A reliable flap design does most of the heavy lifting when you want to lock in indoor climate control.

• The outward swinging panels react instantly to positive pressure from active blowers

• Weighted steel edges snap shut immediately once airflow drops below threshold

• Foam perimeter compression blocks heat transfer across concrete or wood walls

• Standard overlap cuts down draft noise without needing special tools or mounts