A backdraft damper at a louver is installed backward
Backdraft dampers are directional. If the fan closes the blades instead of opening them, pull and reinstall the damper in the correct airflow direction.
Watch out Do not force exhaust through a damper that is being pushed closed by the fan. Check Run the fan briefly only if safe and watch blade movement. Check airflow arrows or hinge direction on the damper frame. Manually move the blades to make sure they swing freely. Verify the exhaust direction through the louver sleeve. Resecure and seal after the blade direction is correct. Steps Run the fan briefly only if safe and watch blade movement. Check airflow arrows or hinge direction on the damper frame. Manually move the blades to make sure they swing freely. Verify the exhaust direction through the louver sleeve. Resecure and seal after the blade direction is correct. Say this to your foreman The backdraft damper at [location] appears reversed
Copy this the fan flow is closing the blades. I checked blade swing and airflow direction. Do you want me to pull and flip the damper frame?
Copy this More in Equipment Connections: RTU, AHU, VAV, Fans & Louvers