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903.2.11.4 Fire Protection for Exhaust Systems
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Where required by the International Mechanical Code, automatic sprinklers shall be provided in ducts having a cross-sectional area of 75 square inches (480 cm2) or more and that convey flammable or combustible components or that have the potential for combustible residue buildup on the inside. When sprinkler protection is installed, and where the application of water constitutes a serious life or fire hazard, a means shall be provided to prevent water accumulation in the duct or the flow of water back to equipment, appliances, machinery, or any apparatus.