| Size | 4 Inch |
|---|---|
| Brand | dojobkinb |
Check the listing for details. 4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Duct.... Condition: New. Listed at 18.00 USD. InstallationThe backdraft damper is installed by pushing it into the ventilation pipe as far as it will go. The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally.
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