4 Inch Backdraft Damper, 1 Way Air Flow Stopper ABS Duct Connector Accessory Ducting Pipe Non Return Valve Backdraft Damper 6in Draft Blocker Ventilation Duct Check Valve（2PCS） 8 inch✕ 25 feet

4 Inch Backdraft Damper, 1 Way Air Flow Stopper ABS Duct Connector Accessory Ducting Pipe Non Return Valve Backdraft Damper 6in Draft Blocker Ventilation Duct Check Valve（2PCS） 8 inch✕ 25 feet1. One Way Airflow Backdraft Damper Designed with a built in backflow damper, this 4 inch backdraft damper allows air to flow in one direction only, effectively preventing reverse airflow and maintaining stable ventilation performance. 2. Blocks Cold Air, Wind & Odors The one way draft blocker helps stop cold air, outside wind, smoke, and unpleasant odors from entering the ventilation duct, improving indoor air quality and comfort. 3. Durable ABS

✔ Ventilation for parking garages

and you can use glue

R6 Insulation: The Best Way to Keep the Heat In

even if it is exposed to the sun and rain

Fits Standard 4 Inch Ducting Designed for standard 4 inch round ventilation ducts

With the dryer vent hose it can be connected to exhaust fans

2 insulated flexible duct is fire-safe

and unpleasant odors from entering the ventilation duct

Quickly connects the duct hose to most utility blower fans and ventilation fittings for better sealing and airflow efficiency

[Widely Application] Designed for bathroom extractor fans

This makes the HVAC system work less hard and cuts utility expenditures

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