Hvac Duct Smoke Detector Requirements

Therefore duct smoke detectors are typically considered mechanical equipment devices instead of life safety devices.

Hvac duct smoke detector requirements.

Ventilation fan systems used to remove air from the inside of the building to the outside of the building. Duct smoke detection may be useful in preventing injury and property dam age in instances such as the following. Duct smoke detectors are not required if the occupied space is served by an area smoke detector system. The duct smoke detector is equipped with an auxiliary relay.

There are other smoke detector safety concerns in air conditioning and heater systems and they can be found in the following reference material. 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. 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. Summary duct smoke detector requirement air moving systems supplying air in excess of 2 000 cfm to enclosed spaces within buildings shall be equipped with an automatic shutoff.

The ashrae handbook of smoke control engineering nfpa life safety book for health.