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What is the air change requirement for a tunnel of 610 m (2000 ft) long...

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What is the air change requirement for a tunnel of 610 m (2000 ft) long with a diameter of 3.4 m (11 ft)?

A.

One complete air change per hour

B.

Two complete air changes per hour

C.

Three complete air changes per hour

D.

Four complete air changes per hour

E.

Five complete air changes per hour

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