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Not fewer than one smoke detector listed for the intended purpose shall be installed in all of the following areas:
  1. Mechanical equipment, electrical, transformer, telephone equipment, elevator machine or similar rooms.
  2. Elevator lobbies.
  3. The main return and exhaust air plenum of each air-conditioning system serving more than one story and located in a serviceable area downstream of the last duct inlet.
  4. Each connection to a vertical duct or riser serving two or more floors from return air ducts or plenums of heating, ventilating and air-conditioning systems, except that in Group R occupancies, a listed smoke detector is allowed to be used in each return air riser carrying not more than 5,000 cubic feet per minute (2.4 m3/s) and serving not more than 10 air-inlet openings.

Related Code Sections Escalators and Moving Walks, Escalator Smoke Detectors
Smoke detectors shall be permitted that shall activate the alarm required by and, after at least 15 s, shall cause initiation of dynamic ...