We have an auditorium project with a walkway that is constructed beside the seating area at the first and second levels. The second level has been provided with beam-type smoke detectors. There is a suspended ceiling below the walkway which is approximately 6-feet (2 m) from the wall. Do we need smoke detectors below this suspended ceiling? The design currently has smoke detectors only inside ceiling void spaces below the walkway - is this in compliance with NFPA 72?
The fire alarm contractor is arguing that if a fire originates at the floor level below this walkway, it will be easily detected by the beam detector at the second level due to the smoke buoyancy. Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
3 Comments
Franck
12/2/2020 11:01:39 am
If there is a possibility that the smoke get trapped for a long time below the balcony (for example, if you have edges at the bottom of the balcony), it could be advisable to provide smoke detection system below them.
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NATARAJAN A.S.
12/4/2020 11:05:40 am
Thanks for the detailed response
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Franck
12/2/2020 11:03:35 am
If anybody reading this post has additional information about recognized samples used for this type of acceptance smoke test in the US (in addition to the reference in NFPA 76), it would be very helpful.
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