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[F] 421.1 General
Where required by the International Fire Code, hydrogen fuel gas rooms shall be designed and constructed in accordance with Sections 421.1 through 421.7.
[F] 421.2 Location
Hydrogen fuel gas rooms shall not be located below grade.
[F] 421.3 Design and Construction
Hydrogen fuel gas rooms not classified as Group H shall be separated from other areas of the building in accordance with Section 509.1.
[F] 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 rooms and spaces.
[F] 421.3.2 Windows
Operable windows in interior walls shall not be permitted. Fixed windows shall be permitted where in accordance with Section 716.
[F] 421.4 Exhaust Ventilation
Hydrogen fuel gas rooms shall be provided with mechanical exhaust ventilation in accordance with the applicable provisions of Section 502.16.1 of the International Mechanical Code.
[F] 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 916.
[F] 421.5.1 System Activation
Activation of a gas detection alarm shall result in both of the following:
  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.
[F] 421.5.2 Failure of the Gas Detection System
Failure of the gas detection system shall automatically activate the mechanical exhaust ventilation system, stop hydrogen generation, and cause a trouble signal to sound at an approved location.
[F] 421.6 Explosion Control
Explosion control shall be provided where required by Section 414.5.1.
[F] 421.7 Standby Power
Mechanical ventilation and gas detection systems shall be provided with a standby power system in accordance with Section 2702.

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Section 421 Special Detailed Requirements Based on Occupancy and Use, Hydrogen Fuel Gas Rooms
Where required by the International Fire Code, hydrogen fuel gas rooms shall be designed and constructed in accordance with Sections 421.1 through ...
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Where required by the International Fire Code, hydrogen fuel gas rooms shall be designed and constructed in accordance with Sections 421.1 through ...
421.1 Special Detailed Requirements Based on Occupancy and Use, General
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