Calculate elevator hoistway pressurization airflow and fan sizing to prevent smoke migration
Input Parameters
Results
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Required Airflow
CFM
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Closed Door Leakage
CFM
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Open Door Flow
CFM
--
Estimated Fan HP
HP
Note: IBC Section 3007 and NFPA 92 require elevator hoistway pressurization for fire service access elevators and occupant evacuation elevators. Minimum pressure differential is 0.05 in. w.g. with all doors closed.
Reference
NFPA 92 Elevator Pressurization:
Closed Door Leak = 2610 x A_leak x sqrt(dP) per floor
Open Door Flow = N_open x Door Area x 200 ft/min
Fan HP = (CFM x SP) / (6356 x Efficiency)
Stack Effect ~ 0.03 in.w.g. per floor