// CODE SNIPPET
601.2.1 Corridor Ceiling
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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:
- The corridor is not required to be of fire-resistance-rated construction.
- The corridor is separated from the plenum by fire-resistance-rated construction.
- The air-handling system serving the corridor is shut down upon activation of the air-handling unit smoke detectors required by this code.
- The air-handling system serving the corridor is shut down upon detection of sprinkler waterflow where the building is equipped throughout with an automatic sprinkler system.
- 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.
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