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If the exhaust outlet is in a wall or with a flange the evacuation efficiency is improved and can be expressed as
vc = 1.33 vo A / (A + 10 x2)
= 1.33 q / (A + 10 x2) (3)
The calculator above can be used if volume is multiplied with 1.33. Use of exhaust hoods improves the evacuation efficiency further.
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