I'm trying to design pressurization system for stairwell.actually, We follow IBC AND ASHRAE IN WHICH I can not find and specific number of doors to be open while designing the system to calculate the pressurization fan capacity.My question is regarding the open door airflow.I have seen many engineers design the system so that the airflow velocity through the open door is around .75 m/s to hold smoke back from entering the stairwell which would increase the fan capacity to meet this demand.But i can not find such a criteria in Ashrae at all.A solved example of pressurization system using Contam software shows that, it is only enough to have a positive pressure difference across open door to guarantee that smoke is held back from entering the stairwell.Am i getting it right? because i'm confused.
Thanks in advance
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