Nfpa 90a requires the first duct smoke detector to be installed on the supply side of air handler units of more than 2 000 cubic feet per minute cfm and requires one on the return side of units of more than 15 000 cfm and serving more than one story.
Duct smoke detector installed.
Install return side detectors at a point before the return air stream is diluted by outside air.
With all wiring in place install the detector head.
Both nfpa 90 and imc 606 2 1 state similar things that can be summarized and paraphrased as if the duct system is designed for more than 2000 cfm the system must have a duct smoke detector installed and if the duct system is designed for more than 15 000 cfm one in the return and supply is required.
Tool free plug in sampling tubes speed and simplify installation.
Install the duct smoke detector on a flat section of hvac duct between six and ten duct widths from any bends or obstructions.
Duct detectors smoke detection installation furthermore intentions for using duct smoke detectors should not be a substitute for area smoke detectors.
Nor should it serve as an early warning detection system.
With power source de energized and the smoke detector not installed wire all connections per engineering drawings.
Innovairflex duct smoke detectors combine an impressive collection of innovations to greatly simplify hvac system monitoring.
Refer to the applicable figures below depending on your duct housing model number.
4 contents of the duct smoke detector kit 1.
The air handling system which is installed in these sensors block the recirculation of smoke in such areas.
The duct smoke sensors are installed in the air duct system to detect any smoke in the duct.
The international mechanical code imc specifies that if the space is air conditioned and the a c unit is over 2 000 cfm a duct smoke detector is required to be installed in the return air duct.
One plastic exhaust tube note.
Install supply side detectors at a point downstream from the supply fan and after the air filter.
Energize the duct detector.
Therefore they should complement the buildings fire detection system and not serve as the primary fire detection system.
Three 10 sheet metal screws for mounting 3.
Sensor power board assembly and cover s 2.
It must be the correct length for the width of the duct where it will be installed.
A sampling tube must be ordered to complete the installation.
Duct smoke sensors are made to detect early smoke or combustion particles present in the air travelling through hvac passways.
