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Fire signal interlock to HVAC system

Question asked by william.jw.lao on Aug 18, 2020
Latest reply on Aug 19, 2020 by milt.werner

Hi, I would like to know which HVAC system should be shutdown during a fire alarm. I know that my AHU will be interlock with the smoke detector to shutdown and MV fans for areas such as the staircase/FFL/carpark will be switched on. However, I am not too sure about general ventilation fans such as the toilet fan or purging fans(not for smoke control.Operates at night to improve air quality) whether they should be shutdown when there is a fire alarm. These fans are just exhausting the air out of the building, so do they actually need to be shutdown?