Backdraft dampers and fan access have to be considered before the duct connection is finalized. A buried or backwards damper creates airflow and service problems later.
The fan at [location/tag] [has / does not have] a backdraft damper shown on the drawing. I want to confirm it is [present / oriented correctly / accessible] before I make the final duct connection.
Watch out
Do not bury or block a backdraft damper where nobody can inspect or service it.
Check
Identify whether the fan is supposed to have a backdraft damper from the drawing, fan schedule, submittal, or detail.
Confirm the damper is present before final connection when the drawing requires it.
Check damper orientation. The blades must open in the intended airflow direction and close when the fan is off, per the damper design.
Check access. The damper and fan connection need to be inspectable or serviceable per approved detail
do not bury the damper where nobody can reach it.
If the damper is missing, inaccessible, or unclear, stop before sealing and document the location.
Steps
Identify whether the fan is supposed to have a backdraft damper from the drawing, fan schedule, submittal, or detail.
Confirm the damper is present before final connection when the drawing requires it.
Check damper orientation. The blades must open in the intended airflow direction and close when the fan is off, per the damper design.
Check access. The damper and fan connection need to be inspectable or serviceable per approved detail
do not bury the damper where nobody can reach it.
If the damper is missing, inaccessible, or unclear, stop before sealing and document the location.
Say this to your foreman
The fan at [location/tag] [has / does not have] a backdraft damper shown on the drawing. I want to confirm it is [present / oriented correctly / accessible] before I make the final duct connection.