Back Draft Damper

The casing and blades are made of galvanized sheet metal or aluminum profiles.

It is designed to ensure airflow when the fan motor is on, and to prevent reverse airflow when it is off. It is used to ensure one-way airflow in air ducts.

The blades open with the thrust of the air and close with their own weight as soon as the flow stops.

It reduces heat loss and prevents threats such as dust, rain, insects, and birds from entering the ventilation system when the system is closed.

Optionally, flow-pressure adjustment can be made according to the flow rate with a counterweight.

It allows the system to react quickly to sudden pressure changes.