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The minimum dimension for rectangular air ducts used to supply combustion air for natural draft systems is _____ inches.
Correct Answer: B
The IMC combustion-air provisions require openings used for combustion air to have a minimum cross- sectional dimension of 3 inches . Where ducts are used, they must be of the same cross-sectional area as the openings to which they connect. That makes 3 inches the correct answer, so Option B is correct.
