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| Best Seller  | 2Pcs 4" Backdraft Damper HVAC Ducting Insert Draft Blocker Duct Adaptor Red The backdraft damper is used to prevent the backflow of smoke or exhaust gas through air duct when the ventilation fan is off, it also prevents debris, dust and odor from entering your room. ... more | FREE shipping go to store |
 | 6" Backdraft Damper HVAC Ducting Insert Draft Blocker Duct Adaptor Red The backdraft damper is used to prevent the backflow of smoke or exhaust gas through air duct when the ventilation fan is off, it also prevents debris, dust and odor from entering your room. ... more | FREE shipping go to store |
| Best Seller  | 2Pcs 4" Backdraft Damper Backflow Preventer Draft Blocker Duct Adaptor Red The backdraft damper is used to prevent the backflow of smoke or exhaust gas through air duct when the ventilation fan is off, it also prevents debris, dust and odor from entering your room. ... more | FREE shipping go to store |
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