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Section BC 421: Hydrogen Fuel Gas Rooms
421.1 General.
421.1.1 Scope.
421.1.2 Storage.
421.1.3 Definitions.
421.2 Location.
421.3 Design and construction.
421.3.1 Pressure control.
421.3.2 Windows.
421.4 Exhaust ventilation.
421.5 Gas detection system.
421.5.1 System activation.
421.5.2 Failure of the gas detection system.
421.6 Explosion control.
421.7 Emergency power.
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421.2 Location.
Hydrogen fuel gas rooms shall not be located below grade.
421.3 Design and construction.
Hydrogen fuel gas rooms not classified as Occupancy Group H shall be separated from other areas of the building in accordance with Section 509.1. Such separation shall have a fire-resistance rating of not less than 2 hours for all occupancy groups.
421.3.1 Pressure control.
Hydrogen fuel gas rooms shall be provided with a ventilation system designed to maintain the room at a negative pressure in relation to surrounding area.
421.3.2 Windows.
Operable windows in interior walls shall not be permitted. Fixed windows shall be permitted where in accordance with Section 716.
421.4 Exhaust ventilation.
Hydrogen fuel gas rooms shall be separately ventilated and provided with mechanical exhaust ventilation in accordance with the applicable provisions of NFPA 2.
421.5 Gas detection system.
Hydrogen fuel gas rooms shall be provided with a gas detection system that complies with Sections 421.5.1, 421.5.2, and 918.
421.5.1 System activation.
Activation of a gas detection alarm shall initiate the following notification and action:
   1.   Initiation of distinct audible and visible alarm signals both inside and outside of the hydrogen fuel gas room.
   2.   Automatic activation of the mechanical exhaust ventilation system.

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