A bedroom airflow exercise specifies a volume of 1,200 ft³ and a target of 3 air changes per hour. What continuous airflow corresponds to that target?
- A20 cfm
- 60 cfm
- C3,600 cfm
- D400 cfm
Where to look it up
https://www.cdc.gov/niosh/ventilation/faq/index.html
Why B is correct
Airflow = ACH × volume / 60 = 3 × 1,200 / 60 = 60 cfm. The target is an exercise assumption, not a minimum bedroom ventilation requirement.