I need to draw 3000 l/s of kitchen exhaust air through 400x400 duct up to 22 levels of a building. the pressure drop is about 600 Pa. The duct is only 1.2 mm thick galvanized steel. Can I know the problems I will have to face other than the high power required? I am not sure whether the pressure on the duct wall is too much? Can the surface of the duct (grease on the surface) get heated due to high velocity ( 19.5 m/s ) Can I use two in line fans to control the pressure up to some extent?
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