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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.
Correct Answer: C
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
