BD-90 : Backdraft Damper, Horizontal Mount
BD-90 : Backdraft Damper, Horizontal Mount
Model BD-90 is a horizontal-mount backdraft damper designed to permit vertical upward airflow while preventing reverse (downward) airflow when the fan is off. The blades open under system pressure differential and close by gravity, providing reliable, power-free backdraft protection. Commonly specified as an accessory for power roof ventilators and centrifugal roof exhaust fans.
Product Highlights
| Airflow Direction |
Vertical Up
|
|---|---|
| Blade Material |
Aluminum
|
| Frame Material |
Galvanized Steel
|
| Maximum Pressure Rating (in. wg.) |
2
|
| Maximum Velocity (fpm) |
1,500
|
| Mounting Orientation |
Horizontal
|
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