When the exhaust fan is running, the damper in the JSF / JSG Plastic Register will open to allow a constant amount of fresh air to enter the room. It will eliminate indoor and outdoor pressure imbalances and create a comfortable environment in the room. When there is strong gusty winds and or when ventilation is not necessary, the damper can be locked manually.
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Features
 Eliminates Pressure Imbalances Automatically
Allows Exhaust fan To Run More Efficiently
Diminishes Internal Noise
Lockable Damper When Ventilation is not necessary
Removable Square face (with or without louvers)
Available for Standard Duct Sizes
Durable ABS Plastic
Off-White Finish
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JSG & JSF Download
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