- Installation: Non return dampers are designed for automatic shut off of individual sections of an air conditioning system
- Size : many sizes are available upon customers request
- Shape : square , rectangular
- Material : Casing formed galvanized sheet steel , Aluminum blades , Aluminum coupling sections (with dampers having two or more blades) , Blade shafts stainless steel , Bearings laminated material with a bearing surface of PTFE/Pb (maintenance-free)
- Packing: plastic bags
Non return dampers are designed for automatic shut off of individual sections of an air conditioning system. With the fan running, the degree of blade opening is a function of the air velocity. If the fan is turned off, the blades close automatically. In a multi fan installation this prevents back draught through the non-operating fans. There are two types of damper can be installed horizontally and vertically.