A classroom of 12m 25m 4m requires 3 air changes per hour. At an a – McqOptions

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1.	A classroom of 12m 25m 4m requires 3 air changes per hour. At an air velocity of 2 m/s, the necessary duct cross section (in m ) is
A.	0.50
B.	0.75
C.	1.00
D.	1.25
Answer» B. 0.75

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