Marine Non-return Damper[Search Related Products]
Non-return dampers are installed in ventilation or air conditioning ducts, and as the fan operates, the blade opening is a function of wind speed.
When the fan is turned off, the blades close automatically. In a multi-fan installation, this prevents backdraft material from non-working fans.
Marine Non-return Damper can be sprayed with armor plate, galvanized sheet, stainless steel or aluminum.