@NFPA 72 I am looking for where the technical justification/requirement came from for Heat Detector placement, as illustrated below, in order to provide a response and justification of my design. Any help is greatly appreciated!!
Those are dead air zones. Think of where you usually find cob webs. Air slows down as it nears a wall, which means it would take a detector longer to notice the increase in heat.
Handbook says this, and references work performed by the Fire Protection Research Foundation in 1993. Handbook also notes that the mounting distance recommendation are for spot-type detectors only.
Hope this helps.
Thanks for the reply!
How would this apply to linear heat detection since the distance recommendations are for spot-type detectors only? Are you aware of any other publications that touch on linear heat detection and dead space areas?
I've been offline for a bit. I looked it up in NFPA 72 (2019 edition).
"220.127.116.11.3.2 Unless otherwise modified by 18.104.22.168.2, 22.214.171.124.2, or 126.96.36.199, line-type heat detectors shall be located on the ceiling or on the sidewalls not more than 20 in. (510 mm) from the ceiling."
I don't know all the science, but maybe this will help you.
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