Lift shaft smoke extraction

[@maudbaabaappiah-nyarko7569]

please what software is used for this illustration

[@sar1138-]

Wow

[@mohammadjumaa2236]

but in high building this shaft will be pressurized by means of fan ,in the fire case , as per nfpa regulations

[@b.a.s.e.schachtentrauchung6233]

This is correct, at least if it is a fire brigade elevator.