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Bathroom and laundry room exhaust ducts shall be permitted to be of gypsum wallboard subject to the limitations of Section 602.5.

Related Code Sections

504.6 Exhaust Systems, Gypsum Wallboard Ducts
Bathroom and laundry room exhaust ducts shall be permitted to be of gypsum wallboard subject to the limitations of Section 602.5 ...
602.5 Duct Systems, Gypsum
Where gypsum products are exposed in ducts or plenums, the air temperature shall be restricted to a range from 50°F (10°C) to 125°F (52°C ...
2508.2 Gypsum Board, Gypsum Panel Products and Plaster, Limitations
Gypsum wallboard or gypsum plaster shall not be used in any exterior surface where such gypsum construction will be exposed directly to the weather ...