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NFPA 72 requires that all points on the ceiling have a detector within a distance of 0.7 times the listed spacing of the detector.
Code Question – Is there language in the code that specifically prohibits blocking a fire alarm device (like a horn/strobe or pull station) with a bookcase?
When a ceiling surface has solid projection more than 4 inches, the distance between the projections center to center determines whether the projection is a joist or beam.
Positive alarm sequence and presignal systems delay occupant notification to allow for time for investigation of a fire. While both systems delay occupant notification, the function of the features and where they are permitted are different.
Audible notification requirements in sleeping areas were changed in the 2013 edition of NFPA 72. The 2010 edition first stated that as of January 1, 2014, audible notification appliances in sleeping area would be required to produce a 520 Hz tone.
A non-required fire alarm system is installed voluntarily by the building owner to meet specific fire protection goals that are not required by the governing codes.
Code Question – “Does the Annex A recommendation for located a smoke detector not closer than 3 feet from a supply or return air opening also apply to air-sampling network smoke detection?”
Notification appliances provide notification to individuals in a protected building by providing audible or visible notification. The specific individuals intended to be notified by the notification appliances determines the operating mode of the appliance.
Ceilings have a direct impact on detector spacing and location. This impact directly affects smoke and heat detectors, so an understanding of ceilings and their impact is a critical aspect to fire alarm design. NFPA 72 defines ceilings in Chapter 3 as an upper...
NFPA 72, Chapter 29, Single- and Multiple-Station Alarms and Household Fire Alarm Systems, is a code within a code.