Duct detector

What is the purpose of a duct detector? Where should duct smoke detectors be located? Tool-free, plug-in sampling tubes speed and simplify installation.

The DNRW is a Watertight intelligent non-relay for use with ONYX Series panels. NFPA 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.

A duct smoke detector is a device or group of devices used to detect the presence of smoke in the airstream of ductwork sections of the HVAC air handling systems typically used in commercial buildings. Duct smoke detectors provide early detection of smoke and products of combustion present in air moving through HVAC ducts. These devices are designed for prevention of smoke recirculation in areas by the air handling systems.

Fans, blowers and complete systems may be shut down in the event of smoke detection. Duct detectors aren’t a replacement for room sensors. Duct Smoke Detectors are a key component of Fire Detection and Fire Alarm systems. The duct smoke detector samples air for early detection of smoke and products of combustion present in air moving through HVAC ducts.

These fans are excluded from the above requirements and. Return air smoke detectors are. For supply air systems with a capacity greater than 0CFM you will find that a duct-mounted smoke detector is required downstream of filters and ahead of any branch connections in the supply system. With regards to Duct Mount Smoke Detectors,.

System Sensor is a global manufacturer of fire and life safety devices, in smoke detection ,. An air duct smoke detector is a regular photoelectric smoke detector , only set up to monitor the air in a plenum, or air duct. The way most photoelectric smoke detectors work is based on reflectivity. Intelligent non-relay photoelectric duct smoke detector. A Light Emitting Diode (LED) shines light into a black chamber so its light will be absorbed by the inside black walls. This is my 16th video in a string of many Khan Academy-styled lessons.

Type Watertight, Photoelectric. Limits (F) -Degrees to 1Degrees. The duct detector shoul when possible, be located a minimum of six duct widths downstream from a source of turbulence (bends, inlets, or deflection plates).

Refer to NFPA 90A, 7 and 1for more information. Complete housing base and cover assembly. Two sampling tube filters. Check Out Duct Detector on eBay. One sampling tube end cap.

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Duct mounted smoke detectors are designed to provide a specific type of protection that cannot be duplicated by any other type of system. However, there has been a tendency to misapply these devices in the past by attempting to use them as a substitute for an early warning smoke detection system. For HVAC systems with airflows exceeding 0cfm, duct smoke detectors are required. This includes where multiple air handling systems utilize common ducts with a combined design capacity greater than 0cfm. Air flowing through the duct is forced into the air intake (inlet) tube via the air intake holes, (facing the airflow) and passes over the detector head.

The air will be drawn out via the exhaust tube back into the HVAC duct. What does make a duct detector detect? DO NOT REMOVE THIS NOTICE!

The detector housing shall be UL Listed per UL 268A specifically for use in air handling systems. The flexible housing of the duct smoke detector fits both square and rectangular footprints. Smoke introduced into this air duct system will be distributed throughout the entire building.

Smoke detectors designed for use in air duct systems are used to sense the presence of smoke in the duct.