What is a fire stair pressurisation test?
Tecair can complete a fire stair pressurisation test for you. We conduct both fire damper and stair pressurisation tests as they relate to the HVAC system. For large buildings, they are an essential annual test that you need to complete for your fire annuals sign-off.
There are specialist companies that do most of the fire equipment, Tecair does the two that are related to HVAC and so we work with your fire company to make it happen.
The fire stairs area needs to have a higher air pressure than outside areas. That way when you open the door the higher air pressure should push most of the smoke away from an open door. So there is a big blower fan that comes on to pressurise the stairwell after a fire alarm signal. The higher air pressure though cannot be too great to hinder the doors operation that needs to allow people in but not push the doors open for example.
So a fire stair pressurisation test is not only testing pressurisation but also the operation of each and every door to the stairwell by measuring the weight required to open it. We also check the status of the fan electrically. Other HVAC equipment such as your Air Handling Units‘s need to shut off with a fire alarm so we check that too.
All this has to be done with your fire panel company present at the site so we can bypass the alarm. That is a lot cheaper than the fire brigade turning up.
The diagram is from Belimo and the blue arrows indicate the higher air pressure.