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Use of the space between the corridor ceiling and the floor or roof structure above as a return air plenum is permitted for one or more of the following conditions:
  1. The corridor is not required to be of fire-resistance-rated construction.
  2. The corridor is separated from the plenum by fire-resistance-rated construction.
  3. The air-handling system serving the corridor is shut down upon activation of the air-handling unit smoke detectors required by the International Mechanical Code.
  4. The air-handling system serving the corridor is shut down upon detection of sprinkler water flow where the building is equipped throughout with an automatic sprinkler system.
  5. The space between the corridor ceiling and the floor or roof structure above the corridor is used as a component of an approved engineered smoke control system.

Related Code Sections

1020.5.1 Means of Egress, Corridor Ceiling
Use of the space between the corridor ceiling and the floor or roof structure above as a return air plenum is permitted for one or more ...
1020.6.1 Means of Egress, Corridor Ceiling
Use of the space between the corridor ceiling and the floor or roof structure above as a return air plenum is permitted for one or more ...
717.5.4.1 Fire and Smoke Protection Features, Corridors
corridor ceilings, constructed as required for the corridor walls as permitted in Section 708.4, Exception 3, are penetrated. A ceiling ...
708.4 Fire and Smoke Protection Features, Continuity
shall not be required to extend above the lower membrane of a corridor ceiling provided that the corridor ceiling membrane is equivalent to corridor wall ...