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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.
421.5.2 Failure of the gas detection system.
Failure of the gas detection system shall automatically discontinue hydrogen generation, activate the mechanical exhaust ventilation system and transmit a supervisory signal to the control panel and a central station.
421.6 Explosion control.
Explosion control shall be provided where required by Section 414.5.1.
421.7 Emergency power.
Mechanical exhaust ventilation and gas detection systems shall be provided with an emergency power system in accordance with Section 2702.
Section BC 422: Ambulatory Care Facilities

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