Reference · Detection
Spot-Type Smoke Detector
A detector that senses smoke at a single point using ionization or photoelectric sensing. Spacing is nominally 30 ft (9.1 m) on smooth ceilings, reduced for beams, slopes and airflow.
NFPA 72: 17.7.3 (spacing), 17.7.6
Section numbers vary by edition — confirm in the edition your AHJ has adopted.
Read more in these guides
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