International Code Council Commercial Mechanical Inspector M2 Question # 9 Topic 1 Discussion
M2 Exam Topic 1 Question 9 Discussion:
Question #: 9
Topic #: 1
Given: A recirculating industrial direct-fired makeup air heater has a rated input of 200,000 Btu/h . Ventilation air is supplied by separate mechanical means.
Outside ventilation air shall be provided to supply at least _____ CFM.
The applicable provision requires direct-fired industrial air heaters to supply outside ventilation air at a rate of not less than 4 cfm per 1,000 Btu/h of rated input where ventilation air is provided by separate mechanical means. For 200,000 Btu/h , the required outside air is:
200,000 ÷ 1,000 = 200
200 × 4 = 800 cfm
So the correct answer is C
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