A dwelling ventilation exercise gives a volume of 12,000 ft³ and a continuous outdoor-air flow of 100 cfm. What outdoor-air change rate results?

Texas ACR A exam practice question · Controls

A dwelling ventilation exercise gives a volume of 12,000 ft³ and a continuous outdoor-air flow of 100 cfm. What outdoor-air change rate results?

A0.0083 ACH
0.5 ACH
C5 ACH
D120 ACH

Where to look it up

https://www.cdc.gov/niosh/ventilation/faq/index.html

Why B is correct

100 × 60 / 12,000 = 0.5 outdoor-air changes per hour. A measured rate does not by itself establish compliance with a whole-house ventilation requirement.

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A dwelling ventilation exercise gives a volume of 12,000 ft³ and a continuous outdoor-air flow of 100 cfm. What outdoor-air change rate results?

A dwelling ventilation exercise gives a volume of 12,000 ft³ and a continuous outdoor-air flow of 100 cfm. What outdoor-air change rate results?

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