nFrame: High quality Galvanized Steel sheet of thickness 0.9mm as standard.
nFrame size: 200mm depth.
nBlades: Double skinned high quality extruded aluminium aerofoil profiles.
nDrive Shaft: Electro-plated square rod of size 12.7mm x 12.7mm
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Designed for use in heating, ventilating and air conditioning systems.
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Joints are welded and protected by aluminium spray coating to prevent rusting.
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Blades are coupled by toothed nylon gears which provides opposed blade operation.
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Hand locking quadrant is provided with clear open/close indication and three intermediate open positions (1/4 โ 1/2 โ 3/4).
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Foam gasket is sealed across the blade edges to minimize air leakage between the blades.
