Backdraft Damper
AssemblyA counterweight-balanced flapper or spring damper in the discharge that opens when the fan runs and closes when it stops to prevent outdoor air backflow. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.
Bill of materials for Backdraft Damper
4 top-level lines as of r144601| # | Item / sub-assembly | Part no. | Qty/assy | Ext. qty | Parts | Type |
|---|---|---|---|---|---|---|
| 1 | Damper Flapper | roof-exhaust-fan-damper-flapper | 1× | 1 | · | part |
| 2 | Damper Hinge | roof-exhaust-fan-damper-hinge | 1× | 1 | · | part |
| 3 | Balance Weight or Spring | roof-exhaust-fan-damper-counterweight | 1× | 1 | · | part |
| 4 | Damper Seat Frame | roof-exhaust-fan-damper-seat | 1× | 1 | · | part |