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
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- Extruded aluminum section frame.
BLADE
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- Extruded aluminum profile .
STUP SHAFT
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- Formed from galvanized steel .
SEAL
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- Sealing foam strips on the blades where they overlap to ensure a good seal and to reduce noise .
SIZES
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- WIDTH * HEIGHT max size : (1000 MM * 1000 MM) for single section .
FINISH
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- Standard mill finish or powder coated .
DUCT MOUNTED
Non return damper designed to be duct mounted
FRAME
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- Made from ga 20. galvanized steel.
BLADE
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- Made from galvanized steel or aluminum .
SPINDLES
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- Round spindles Ø 12 mm made from galvanized steel bar .
SEAL
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- Gasket is provided on blade tips for low leakage.
SIZES
WIDTH * HEIGHT
max size : (1000 MM * 1000 MM) for single section .
FINISH
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- Standard mill finish or powder coated .