| Brand | Unbranded |
|---|---|
| Sensor Technology | Temperature |
| Power Source | Electric |
| Programmability | Programmable |
Check the listing for details. 4 Inch Professional Backdraft Damper Shutter Connector Duct. Condition: New. Listed at 19.99 USD. Easy Installation: The duct damper opens and closes automatically, allowing only one-directional airflow. The damper blades open only in the outflowing air direction when the shutter is installed. This also applies to vertical installation.
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