Duct Smoke Detector Installation Requirements

Refer to nfpa 90a 72 and 101 for more information.

Duct smoke detector installation requirements.

Smoke alarms should be installed at least 10 feet 3 meters from a cooking appliance to minimize false alarms when cooking. Detector installation 5 1 verify air flow direction and velocity model d4120 detectors are designed to be used in air handling systems with air velocities of 100 to 4000 feet per minute. At these locations air flow is less turbulent and the air smoke mixture should be more homogenous. The duct detector should when possible be located a minimum of six duct widths downstream from a source of turbulence bends inlets or deflection plates.

Duct detectors aren t a replacement for room sensors. Mount smoke alarms high on walls or ceilings remember smoke rises. To ensure correct operation install the duct detector using the following guidelines. 2 6 p n 3101210 rev 02 iss 28jan13.

Duct smoke detection nfpa 90a code requirements there are exceptions to the two basic requirements. Energize the duct detector. Return air smoke detectors are not required when there is a protection of. The local authority having jurisdiction should be consulted prior to the installation of the damper and smoke detector.

Duct smoke detectors alarms and the code. Standard location when factory mounted will be on the side opposite the damper actuator. If the duct system is designed to carry more than 2000 cfm 5 tons nominal of air you need one in the. With power source de energized and the smoke detector not installed wire all connections per engineering drawings.

Ventilation fan systems used to remove air from the inside of the building to the outside of the building. Refer to the applicable figures below depending on your duct housing model number. A duct smoke detector should shut off a typical blower and fresh air and turn on the exhaust. Install the duct smoke detector on a flat section of hvac duct between six and ten duct widths from any bends or obstructions.

With all wiring in place install the detector head. Wall mounted alarms should be installed not more than 12 inches away from the ceiling to the top of the alarm.