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Designed for 4 Inch Ducts: Each backdraft damper fits 4 in / 100 mm duct openings and measures 3.5 in / 88 mm long with a 0.5 mm / 0.02 in wall thickness. Please confirm your duct size before purchase.
Helps Reduce Backdraft: The spring-loaded flaps open with exhaust airflow and close when airflow stops or reverses, helping reduce unwanted drafts, odors, debris and outside air from entering the duct.
Durable Mixed-Metal Construction: Built with a galvanized steel body, aluminum flaps, and stainless steel spring and axis for everyday ventilation use in home HVAC ducting applications.
Not designed for plastic ducts.
2 Pack for Multiple Projects: Includes two 4 inch inline duct dampers for installing in separate ventilation ducts or keeping one ready for another setup. Insert into the duct and align with the airflow direction for proper operation.
