UpCodes logo
Go To Full Code Chapter
Where a smoke exhaust system is installed in an underground building as required by Section 405, automatic fire detectors shall be provided in accordance with this section.
907.2.18.1 Smoke Detectors
A minimum of one smoke detector listed for the intended purpose shall be installed in the following areas:
  1. Mechanical equipment, electrical, transformer, telephone equipment, elevator machine or similar rooms.
  2. Elevator lobbies.
  3. The main supply and return and exhaust air plenum of each air-conditioning system serving more than one story and located in a serviceable area downstream from filters on supply ducts and in return/exhaust ducts 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 cfm (2.4 m3/s) and serving not more than 10 air inlet openings.
907.2.18.2 Alarm Required
Activation of the smoke exhaust system shall activate an audible alarm at a constantly attended location.

Related Code Sections

513.20.1 Exhaust Systems, Exhaust Capability
Where compartmentation is required, each compartment shall have an independent smoke exhaust system capable of manual operation. The system shall ...
909.21.1 Fire Protection Systems, Exhaust Capability
Where compartmentation is required, each compartment shall have an independent, automatically activated smoke exhaust system capable of manual ...