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501.4.2.5 Separate Makeup Air and Combustion Air Openings
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When both makeup air and combustion air openings are required, they shall be provided through separate openings to the outdoors, subject to IFGC Section 304, to determine requirements for air for combustion and ventilation:
Exception:Combination makeup air and combustion air systems may be approved by the building official where they are reasonably equivalent in terms of health, safety, and durability.