NV C-1A Boilers Practice Questions - Nevada C-1A Boilers Contractor Examination Exam

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A 180,000 Btu/h boiler takes all combustion air from outdoors through two vertical ducts. Metal louvers provide 75 percent free area. What minimum gross area is required for each opening?

18 square inches 45 square inches 60 square inches 180 square inches

Correct Answer:

60 square inches

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