Even if we pressurize our elevator shaft with a huge blower fan to eliminate the dedicated elevator lobby, we must still vent. Once the smoke enters the hoistway, it can move throughout the entire building. Elevator shafts need ventilation for the same reason they require protection from smoke, usually by dedicated lobbies. Hoistways must receive adequate ventilation simply because there is no such thing as a smoke-proof elevator hoistway door they all leak air and smoke rather badly. The Building Code has always required ventilation of elevator hoistway shafts, as seen in 3004.5.1 of the 2014 Code. Take elevator hoistway shaft vents, for example. Not even the New York City construction codes are exempt. Unfortunately, thanks in part to that stretched-out time frame, some things done at New Building approval come back to haunt at sign-off time. Part of the joy of this industry comes from watching lines on a page evolve into a finished building over several years.
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