PVC Exhaust Fan Check Valve Draft Blocker Damper Ventilation Grill Draught Back Shutter for Inline Ducting Home Pipe Fittings

Does it include wireless functionality?：No Does it include a Battery?：No High-concerned chemical：None isCustomized：Yes Shape：Round Material：PVC Origin：Mainland China Check Valves：Pipe check valve Pipe Ventilator Air Valve：Exhaust Outlet Plumbing Exhaust Outlet：Backdraft Damper Duct Backflow Preventer Inline Fan Vent Deflector：Back Draft Damper Exhaust Pipe Check Fan Valve：Pipe Check Fan Valve ventilation valve：pipeline valves quick exhausted valve：check valve ventilation fan exhaust check valve：Backdraft Damper pipe fitting：Range hood parts Bathroom smoke-proof Check Valve：check valve for air Ventilation Grill system：Valve Parts check valve for compressor：Public Flue Check Valve

Does it include wireless functionality?: No Does it include a Battery?: No High-concerned chemical: None isCustomized: Yes Shape: Round Material: PVC Origin: Mainland China Check Valves: Pipe check valve Pipe Ventilator Air Valve: Exhaust Outlet Plumbing Exhaust Outlet: Backdraft Damper Duct Backflow Preventer Inline Fan Vent Deflector: Back Draft Damper Exhaust Pipe Check Fan Valve: Pipe Check Fan Valve ventilation valve: pipeline valves quick exhausted valve: check valve ventilation fan exhaust check valve: Backdraft Damper pipe fitting: Range hood parts Bathroom smoke-proof Check Valve: check valve for air Ventilation Grill system: Valve Parts check valve for compressor: Public Flue Check Valve