After gas discharge: ventilating the room and restoring operations
The end of discharge does not mean the room is safe to enter. First ensure people's safety, then arrange gas removal and confirm safe conditions. Only then restore equipment and protection.
What to do immediately after discharge
Leave the protected area and follow the facility's evacuation plan. In a fire, call 112 or 101 and notify the fire safety officer. Do not return for belongings or check suppression results yourself.
Restrict access. Authorised personnel must manage the system and building services. Do not start ordinary ventilation or open doors for airing before the work leader approves: this can disrupt the designed suppression regime and spread combustion products.
Re-entry procedure
- 01
Restrict access
Evacuation, emergency calls and the facility's emergency plan
- 02
Arrange gas removal
After approval, using designed equipment and trained specialists
- 03
Check the atmosphere
Instrumented checks for potential hazardous substances and facility conditions
- 04
Restore protection
Inspection, module replacement or refilling, system checks and documentation
How ventilation is organised
Gas removal must be addressed in the design and operating instructions. Specialists check where air is extracted, where it is discharged and whether hazardous substances could reach adjacent rooms or air intakes.
Recirculation inside a server room is not equivalent to extracting contaminated air outdoors. An open window is not a universal substitute for the designed system. Room geometry, stagnant areas, floor voids and actual ventilation capacity matter.
Do not prescribe a universal ventilation duration. It depends on the agent, room volume, fire effects and air exchange. Re-entry is determined by situation assessment and necessary instrumented checks.
What to check before restarting equipment
| Component | What specialists check |
|---|---|
| Protected room | Effects of fire and heat, tightness, doors and cable entry points |
| Ventilation | Damper, actuator and designed interlock operation |
| Modules and pipework | Condition of equipment, mountings, nozzles and connections |
| Control systems | Detectors, controls, warnings, power and signal transmission |
| Protected equipment | Suitability for restart after fire and combustion product exposure |
System discharge does not itself confirm that servers or electrical equipment are serviceable. The responsible specialist decides whether to restart them after inspection and necessary checks.
How to restore the suppression system
The service organisation determines the work from equipment datasheets and inspection results. Discharged modules are replaced with prepared units or sent for servicing and refilling. After installation, system readiness and linked building services are checked.
Until protection is restored, the facility manager determines permitted operation and compensating measures. Simply resetting the panel indication does not make the system ready.
Results are recorded in operating documents. To prepare for module replacement, read our article on extinguishing agent stock and reserve.
Which documents to keep at hand
You need the system design, discharge response instructions, module datasheets, agent information and the service organisation’s contacts. General system and room requirements appear in Section 9 of SN RK 2.02-02-2023 (PDF); design solutions are also addressed in SP RK 2.02-102-2022 (PDF).
Equipment datasheets are available under Documentation. The opening illustration shows the air extraction principle and does not replace a facility-specific ventilation design.
Questions and answers
Can windows and doors simply replace ventilation?
Do not replace designed gas extraction with opening doors or windows. Contaminated air can remain in stagnant areas and spread to adjacent rooms. Follow facility instructions and confirm safety through necessary instrumented checks.
Does gas damage servers and electronics?
The outcome depends on the agent, system parameters and fire effects. Smoke, heat, decomposition products and pressure changes can damage equipment. After discharge, electronics cannot be assumed serviceable without inspection and checks.
Must adjacent rooms be evacuated?
Follow the evacuation plan and responsible services' instructions. Gas movement into adjacent areas is assessed through ventilation, leakage and pressure relief routes. Do not independently assume adjacent rooms are safe.
How much does refilling after discharge cost?
Cost depends on agent type and mass, module size and condition, inspection scope and transport. Send the module list, agent details and discharge circumstances for a quotation.
Can gas be recovered after a false discharge?
Agent discharged into the room is not returned to a module for reuse. The service organisation inspects the system, identifies the false discharge cause and restores the charge and readiness.
Can residual gas in a module be used?
Residual agent after discharge is not the calculated charge of a ready system. Specialists check the module and restore its charge under operating documentation. Do not rely on it before readiness is confirmed.
Who should ventilate the room: facility staff or the contractor?
Responsibilities are set in facility instructions and the service contract. Authorised staff arrange gas removal and air monitoring; the service organisation restores the system. Responsible personnel and re-entry procedures should be defined beforehand.