Hvac Duct Smoke Detection

Duct detectors smoke detection nfpa 90a code requirements.

Hvac duct smoke detection.

Duct smoke detectors provide early detection of smoke and products of combustion present in air moving through hvac ducts. The damper is still protected with the in duct smoke detector to ensure the rating of the wall to shut the damper upon detection of smoke and if the in duct smoke detector activates then we go through the shut down process of the fans and dampers throughout the building as exampled above. I ve had this question asked of me several times. Tool free plug in sampling tubes speed and simplify installation.

Its purpose is to prevent the re circulation of smoke from an area on fire to areas unaffected by the fire when used with a xp95 or discovery detector. Nfpa 72 also states that a duct smoke detector is not allowed to replace an area smoke detector mainly because if the air handling unit ahu is not running the detector would not detect smoke. Therefore duct smoke detectors are typically considered mechanical equipment devices instead of life safety devices. The duct smoke detector should be compatible with building automation and fire alarm systems.

Hvac duct smoke detection. Fans blowers and complete systems may be shut down in the event of smoke detection. One unit can accommodate multiple installation footprints to overcome mounting constraints. Duct smoke detectors are a key component of fire detection and fire alarm systems.

A heating ventilating or air conditioning hvac fan motor overheats and resulting smoke is sensed by the duct smoke detector installed in the main supply duct. The intelligent duct smoke detector provides early detection of smoke in the air moving through heating and ventilation hvac ducts in commercial and industrial premises. A duct smoke detector should shut off a typical blower and fresh air and turn on the exhaust. These devices are designed for prevention of smoke recirculation in areas by the air handling systems.

If the duct system is designed to carry more than 2000 cfm 5 tons nominal of air you need one in the return if imc is being followed and the supply if nfpa is being followed. Why are smoke duct detectors required on the supply side as noted above. The duct smoke detector is equipped with an auxiliary relay. This one hour webinar includes basic code and testing requirements the different types of duct smoke detectors and how they operate installation and placem.

Duct detectors aren t a replacement for room sensors. Innovairflex duct smoke detectors combine an impressive collection of innovations to greatly simplify hvac system monitoring.