Rectangular Backdraft Damper

The rectangular check valve is made from high-quality galvanized steel sheet and features a mechanical duct-type flange, allowing for direct installation onto the duct. Its width and height dimensions can be matched precisely to the duct’s diameter for seamless integration. When the fan is running, the air velocity must exceed 8 m/s, lifting the blades to allow airflow to pass through. Once the fan stops, the blades automatically close, preventing backflow of air.

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Rectangular Backdraft Damper

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