Mich. Admin. Code R. 29.7104
Rule 104. Sections 4-3 to 4-3.5 of the storage and handling of gaseous and Liquefied H2 code are added as follows:
4-3 Separate buildings.
4-3.1 Separate buildings containing more than 300 gallons (1137 liters) of liquefied H2 shall be constructed of noncombustible or limited-combustible materials on a substantial frame. Walls and roofs shall be lightly fastened. All venting elements shall be designed to relieve at a maximum pressure of 25 pounds/square foot. Doors shall be located in such a manner that they are readily accessible to personnel in an emergency. Exception: Window glazing may be of plastic.
Exception: Explosion venting shall be in accordance with section 4-4.3.
4-3.2 Ventilation to the outdoors shall be provided. Inlet openings shall be located within 18 inches (45.72 centimeters) of the floor in exterior walls only. Outlet openings shall be located at the high point of the room in exterior walls or roof. Both the inlet and outlet vent openings shall have a minimum total area of 1 square foot/1000 cubic foot (0.3 square meters/305 cubic meters) of room volume. Discharge from outlet openings shall be directed or conducted to a location that allows for dissipation of the exhaust air in the ambient surroundings away from air intakes and occupied spaces.
4-3.3 There shall be no sources of ignition within the room or area where the H2 system is installed.
4-3.4 Electrical wiring and equipment shall comply with section 2-7.
Exception: All electrical wiring and equipment in the separate building shall be class I, division 2, group B.
4-3.5 Heating, if provided, shall be by indirect means such as steam or hot water.
Exception: Electrical heating shall be in accordance with section 4-3.4.
Mich. Admin. Code R. 29.7104