Fire Alarm and Security System Specialists
0845 872 5999


The application of a gas suppression system requires that the room space (including the total envelope floor void / ceiling void) are adequately sealed to contain the weight of gas within the space for the required period of time against an allowable leakage rate.

The means to test the room for ‘ tightness ‘ is by the Retrotec Room Integrity Door Fan Pressure Test means. A calibrated and certified axial flow fan is latched into rigid expandable panels that fill the opened door frame space.

By running the calibrated fan at a certain speed thus generating pressure into / from the space, and by monitoring the pressure differential within and external to the room, that flow rate is actually measured, data inputted to software together with the protected height and the weight of gas ( FM200 / FE25 / Novec 1230 or Proinert / Argonite / Inergen Inert Gas, yes inert gas is basically air, but it still has weight ! ) and a descending interface height hold time, or mixing concentration result is obtained.

If the room is tight enough, then a pass is achieved. If the room is too leaky, then a fail is recorded and the room requires further sealing and a retest until a pass is achieved.

Gemini Fire carry out such Room Integrity testing and can offer a remedial sealing and retesting service.

Such testing is required for new build to (a) certificate the room / system, and (b) to certify that indeed the design concentration is reached in the first instance as excessive leakage may be so great as to lose the design concentration during the release period itself.

Testing is required each year to re-certify the room and the gas suppression performance, and may be a requirement of the Clients Insurance Company to revalidate the protection provided to the space.

To book a door fan pressure test or to discuss your requirements in more detail contact us on: 0845 872 5999

General Pictures
Gemini Fire Management Ltd
Offices in London and the South East
Tel: 0845 872 5999