904.3.7.1.4 Pressure relief venting.
FC § 904.3.7.1.4
The protected area enclosure shall be provided with suitable pressure relief venting which vents outdoors. Exception: Such venting shall not be required when a registered design professional certifies that the walls, ceilings and floors comprising the protected space have sufficient porosity and leakage to prevent damage to the integrity of such space upon discharge of the extinguishing agent, and that the inert gas agent leakage into other non-flooded rooms and spaces will not reach dangerous concentrations.













