Built int he air duct is suited for quantity control. It's not suited for closing the air-tightness.
General producting sizes
Width 200 mm - 1500 mm
Height 200 mm - 1500 mm
Type
gears are moving opposite
building length: 180 mm
house is made of galvanized steel sheet
blades are made of galvanised steel profile
it has got more parts 1940mm above
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