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5307.4.4 Pressurization and Ventilation
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Rooms or indoor areas in which carbon dioxide enrichment is provided shall be maintained at a negative pressure in relation to the surrounding areas in the building. A mechanical ventilation system shall be provided in accordance with the International Mechanical Code that complies with all of the following:
- Mechanical ventilation in the room or area shall be at a rate of not less than 1 cfm per square foot [0.00508 m3/(s • m2)].
- When activated by the gas detection system, the mechanical ventilation system shall remain on until manually reset.
- The exhaust system intakes shall be taken from points within 12 inches (305 mm) of the floor.
- The ventilation system shall discharge to the outdoors in an approved location.
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