Existing office buildings, 100 feet or more in height, having air conditioning and/or mechanical ventilation systems that serve more than the floor on which the equipment is located, shall be provided with at least how many smoke shafts, by means of which smoke and heat shall be mechanically vented to the outdoors?
A. four smoke shafts
B. three smoke shafts
C. two smoke shafts
D. one smoke shaft
Answer: D. one smoke shaft
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