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4. An office has dimensions of 40m x 20m x 3m (height). The air velocity is constant with speed of 6m/s. The air change per
4.
An office has dimensions of 40m x 20m x 3m (height). The air velocity is constant with speed of 6m/s. The air change per hour is 13.5 Calculate the size of duct A , B & C, and the fan rating of this system.
(20 marks)
(note: length indicated in the diagram is equivalent length)
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