Fans & Ventilation
Ventilation provides other benefits besides cooling. Without proper ventilation, the air can become stale and condensation can occur, resulting in a risk of respiratory illness and general poor health.
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S&P CAR-100 4 Inch Metal Backdraft Damper
S&P USA Ventilation Systems
$15.14Series/Model: CARCAR Series Backdraft DampersBackdraft dampers are designed with galvanized steel collars and have lightweight aluminum damper blades. They are spring loaded for positive closure.Details:Backdraft DamperType CircularDuct Size 3-15/16 Inch...36899$15.14