Posted by: Pdfprep
Post Date: February 8, 2021
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
Answer: C
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