Non Return Dampers
Non Return Dampers are designed for automatic shut off of individual sections of the air conditioning system.
With the fan running, the degree of blade opening is a function of air velocity.
If the fan is turned off, the blade will close automatically. In a multi fan installation system, this prevents back draught through the non- operating fan.
They may be referred to as Shutoff Dampers or Back Pressure Dampers or Pressure Relief Damper or Back Draft Shutter.
GRAVITY SHUTTER
The gravity air shutter is a wall mounted device. It is composed of a set of horizontally mounted blades; they are normally closed and are free to rotate about the horizontal axis to equalize the pressure across it.
FRAME
- Extruded aluminum section frame.
BLADE
- Extruded aluminum profile .
STUP SHAFT
- Formed from galvanized steel .
SEAL
- Sealing foam strips on the blades where they overlap to ensure a good seal and to reduce noise .
SIZES
- WIDTH * HEIGHT max size : (1000 MM * 1000 MM) for single section .
FINISH
- Standard mill finish or powder coated .
DUCT MOUNTED
Non return damper designed to be duct mounted
FRAME
- Made from ga 20. galvanized steel.
BLADE
- Made from galvanized steel or aluminum .
SPINDLES
- Round spindles Ø 12 mm made from galvanized steel bar .
SEAL
- Gasket is provided on blade tips for low leakage.
SIZES
WIDTH * HEIGHT
max size : (1000 MM * 1000 MM) for single section .
FINISH
- Standard mill finish or powder coated .