Coffee Break Training: Fire Alarms & Detection: Smoke Detection in Duct Systems: Part 1   [open pdf - 268KB]

"Smoke detection is installed in heating, ventilating, and air conditioning (HVAC) duct networks to prevent smoke from migrating through a structure's air handling system. Circulating, closed-air handling systems often use the terms 'supply' and 'return.' Supply air is that air which has been conditioned (heated or cooled) and is being supplied to an occupied space such as a classroom, bedroom, kitchen, etc. Return air is taken from the space and is returned to the air handling system for conditioning. Generally, those air handling systems where the return air volume equals or exceeds 2,000 cubic feet per minute (56,700 Lpm) require smoke detector shutdown and local mechanical codes or National Fire Protection Association (NFPA) 90A, Standard for the Installation of Air-Conditioning and Ventilating Systems to provide specific requirements. NFPA 72, National Fire Alarm and Signaling Code recommends the use of wall- or ceiling-mounted open area detectors for smoke control in buildings because of the chance that smoke in the HVAC systems will be diluted by the air movement. Detectors may be ionization type, photoelectric, or both."

Report Number:
Coffee Break Training - Fire Protection Series No. FP-2012-30
Public Domain
Retrieved From:
United States Fire Administration: http://www.usfa.fema.gov/
Media Type:
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