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• <br /> 2015 IMC <br /> 502.9 Hazardous Materials—requirements for Specific Materials <br /> Exhaust ventilation systems for specific hazardous materials shall be provided <br /> as required in Section 502.8 and Sections 502.9.1 through 502.9.11. <br /> 502.9.1 Compressed Gases—medical Gas Systems <br /> Rooms for the storage of compressed medical gases in amounts exceeding <br /> the permit amounts for compressed gases in the International Fire Code, and that <br /> do not have an exterior wall, shall be exhausted through a duct to the exterior <br /> of the building. Both separate airstreams shall be enclosed in a 1-hour-rated <br /> shaft enclosure from the room to the exterior. Approved mechanical ventilation shall <br /> be provided at a minimum rate of 1 cfm/ft2 [0.00508 m3/(s • m2)] of the area of <br /> the room. <br /> SHAFT ENCLOSURE.The walls or construction forming the boundaries of a shaft. <br />