Hello; Regarding the installation of smoke sensors in rooms with flat and high ceilings (20 feet), what is the maximum height at which I can use this type of device. They are air-conditioned rooms. We are working with Notifier fsp-951
In the 2019 NFPA 72, the location and spacing for smoke detectors are provided in the performance criteria of Section 17.7.3 or otherwise the provisions for performance-based designs in accordance with Section 17.3.
Discussion in Annex A, in my opinion was the intent, of the prescriptive standards for spacing the detectors.
The specifications for the FSP-951 Series Addressable Photoelectric Smoke Detectors:
DETECTOR SPACING AND APPLICATIONSNOTIFIER recommends spacing detectors in compliance with NFPA 72. In low airflow applications with smooth ceiling, space detectors 30 feet (9.1m). For specific information regarding detector spacing, placement, and special applications refer to NFPA 72. A System Smoke Detector Application Guide, document A05-1003, is available at www.systemsensor.com.
Items noted in the System Smoke Detector Application Guide:
Additional help from NFPA 72 Annex A:
In summary there are no ceiling height criteria in the 2019 NFPA 72 - just performance requirements and guidelines for location and spacing on ceilings. The Annex A does suggest the accessibility for maintenance in high ceiling areas to considered and other smoke detectors that access can be provided.
I would add that we too often see detection placed where routine maintenance is next to impossible, resulting in problems. This goes for all types of detection, emergency lighting and signage. The Code may allow devices of any type to be high up, but the generally occupancy and maintenance staff may not be able to conduct requisite cleaning, checks and tests.
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