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- $39.99iPower 4 Inch 195 CFM Inline 8 Feet Shutter Grow Tent Ventilation Exhaust, HVAC Heating Cooling, 2 Clamps Included, 4'' Fan + Ducting + Backdraft DamperAmazon
- $13.90- 4" Inch Backdraft Damper for Straight or Flex Duct. Bathroom Exhaust Fan. Kitchen Hood Exhaust Fan and Different Dryer Fan Backflow Preventer. Steel Damper with Aluminum Valve Flaps (4")Amazon
- $47.99HG Power 8 Inch Exhaust Fan, 576CFM Stainless Steel Kitchen Exhaust Fan, Wall Mounted Garage Ventilation Fan, Basement Extractor Fan with Backdraft Damper for Home Office Commercial Use, BlackAmazon
- $46.99HG Power 8 Inch Kitchen Exhaust Fan, 576CFM Stainless Steel Bathroom Exhaust Fan, Wall Mounted Garage Ventilation Fan, Basement Extractor Fan with Backdraft Damper for Home Office Commercial UseAmazon
- $17.89Uonlytech Control Valve Range Fan Hood Deflector Backdraft Shutter Dryer Exhaust Hose Backflow Preventer Dryer Vent Backflow Shutter Household Fans Hvac Damper Manual Pvc White Exhaust FanAmazon
- $25.9910 Inch Backdraft Damper, HG Power Draft Blocker One-Way Airflow Stopper Backflow Preventer for HVAC Ducting, Inline Fan, Dryer, Exhaust Hood, Bathroom, 250mm, SilverAmazon
- $35.99PATIKIL 6"-7" Backdraft Damper, 1 Set ABS Flexible Airflow Inline Backflow Duct Adaptor Draft Blocker for Kitchen Bathroom Exhaust Fan, BlueAmazon
- $11.99Air Duct Check Valve Backdraft Damper Duct Draft Stopper Public Flue Check Valve for Range Hoods Kitchen Exhaust Fans, Small Style CAmazon
- $20.29PATIKIL 6 Inch Backdraft Damper, PVC Ducting Hose Airflow Insert Backflow Preventer Shutter, One-Way Draft Stopper for Kitchen Bathroom Exhaust Vent FansAmazon
- SAVE $1.60$18.39$19.99PATIKIL 4 Inch Backdraft Damper, 2Pcs PVC Ducting Hose Airflow Insert Backflow Preventer Shutter, One-Way Draft Stopper for Kitchen Bathroom Exhaust Vent FansAmazon