When a gaseous suppression system discharges, it releases a large volume of gas into a sealed room very quickly, and that creates a sudden change in pressure. Without somewhere for that pressure to go, the force can damage walls, windows, ceilings and doors, or even compromise the very seal the system depends on. Pressure relief venting protects the structure by allowing excess pressure to escape safely during discharge. MEP sizes, supplies and installs pressure relief vents as part of every gaseous system.
A pressure relief vent is a damper set into the wall of the protected room that stays closed in normal use and opens automatically when the pressure from a discharge reaches a set point. This lets the peak pressure bleed off while the room still retains enough agent to suppress the fire. The vent then closes again. The aim is to protect the building fabric without letting so much gas escape that the system can no longer hold its design concentration.
A vent that is too small will not relieve the pressure in time; one that is too large lets agent escape and shortens the hold time. Correct sizing depends on the agent, the discharge rate, the room volume and the strength of the enclosure, and it is calculated as part of the system design. Inert gas systems in particular generate high peak pressures and almost always need venting. We calculate the required vent area for each installation and confirm the enclosure performs with room integrity testing.
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It is an automatic damper fitted to a room protected by gas suppression that opens during a discharge to release excess pressure and protect the building structure.
Discharging a large volume of gas quickly into a sealed room causes a rapid pressure change that can damage walls, windows and doors unless it is relieved.
Most do, especially systems that produce high peak pressures. The need and the vent size are confirmed by calculation during system design.
In an external or suitable internal wall of the protected room, positioned so pressure can escape to a safe area without letting the agent leak away too quickly.
From the agent type, discharge rate, room volume and the pressure the enclosure can withstand. Getting this right protects the structure while preserving the agent hold time.
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