FM200 Room Integrity (Door Fan) Testing — Dubai
FM200 room integrity testing, also called a door-fan test, pressurises the protected enclosure with a calibrated fan to measure how much it leaks. From that leakage the test calculates whether the room can hold FM200 at design concentration for the required hold time — usually ten minutes — so the agent stays long enough to fully suppress the fire and prevent re-ignition. It is required at commissioning and at set intervals thereafter, and QSERV documents the pass or fail and any leakage paths for DCD records.
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A leaking room lets the agent drain away
FM200 suppresses fire by flooding the room and staying at concentration long enough to stop re-ignition. Every gap — cable penetrations, door seals, ceiling voids, dampers left open — bleeds agent out. If the room cannot hold, the fire can restart after the gas has escaped, even though the system fired correctly.
- The agent must hold at concentration, not just flood once.
- Cable and pipe penetrations are the most common leak paths.
- Poor door seals and gaps under doors drain agent fast.
- Open dampers and ceiling voids defeat the flooding.
- A system that fires but does not hold can allow re-ignition.
A door fan measures leakage, not opinion
Instead of guessing, a door-fan test puts a calibrated fan in the doorway and pressurises the room. The airflow needed to hold that pressure reveals the total leakage area, and NFPA 2001 calculations turn that into a predicted hold time. It proves — with numbers — whether the room retains FM200 for the required period.
- Calibrated fan pressurises the enclosure to a set point.
- Measured airflow gives the room's total leakage area.
- NFPA 2001 calculation predicts the achievable hold time.
- Pass or fail is against the design hold-time requirement.
- Leakage paths located so failures can be sealed and re-tested.
Test at commissioning and when the room changes
Integrity is not a one-off. A room passes at commissioning, but new cable trays, an added CRAC unit or a re-sealed floor can change its leakage overnight. QSERV re-tests at set intervals and after any room modification, so the FM200 you rely on is still backed by an enclosure that holds.
- Mandatory at commissioning before hand-over.
- Re-tested at set intervals as part of maintenance.
- Repeated after cabling, cooling or fabric changes.
- Failures traced to specific leaks for rectification.
- Results documented for your logbook and DCD records.
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Frequently Asked Questions
Answers for data-centre and facilities owners on FM200 room integrity and door-fan testing.
What is an FM200 room integrity or door-fan test?
It is a test that pressurises the protected room with a calibrated fan to measure how much it leaks. From that leakage, NFPA 2001 calculations predict whether the room can hold FM200 at design concentration for the required hold time, usually ten minutes, so the agent stays long enough to suppress the fire and prevent re-ignition.
Why is enclosure integrity so important for FM200?
FM200 suppresses fire only while it stays at concentration. If the room leaks through cable penetrations, door gaps or open dampers, the agent drains away and the fire can re-ignite even though the system discharged correctly. A door-fan test proves the room actually holds the agent long enough.
How often should room integrity be tested?
A room is tested at commissioning and then at set intervals as part of maintenance, and again after any change to the room fabric such as new cabling, added cooling units or re-sealed floors. Those changes can alter leakage overnight, so re-testing keeps the predicted hold time valid.
What happens if the room fails the integrity test?
QSERV locates the leakage paths — commonly cable and pipe penetrations, door seals and dampers — so they can be sealed. The room is then re-tested to confirm it now holds FM200 for the required hold time before the result is accepted and documented.
Does an FM200 system need this test if it already passed once?
Yes. Passing at commissioning does not stay true forever. Any modification that adds or opens a leak path can reduce the hold time, so periodic re-testing and re-testing after room changes are needed to keep the protection reliable.
Do you provide documentation for DCD from the test?
Yes. QSERV records the measured leakage, the calculated hold time, the pass or fail result and any leakage paths found, and provides it for your fire safety logbook and Dubai Civil Defence records.