^depends on the systems being used for mech.
Generally mechanical is in the ceiling, although raised flooring is becoming popular.
So say you have a commercial building with 12' clear between floors, take 2' of that for mech/elec. etc.
In residential buildings you will see bulkheads used more commonly as well as some with inslab venting.
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"The destructive effects of automobiles are much less a cause than a symptom of our incompetence at city building" - Jane Jacobs 1961ish
Wake me up when I can see skyscrapers
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