Duct smoke

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Duct Smoke Detectors are a key component of Fire Detection and Fire Alarm systems. Duct detectors aren’t a replacement for room sensors. Both the IMC and NFPA 90A state that, if multiple air handlers serve the same area and the combined air volume is greater than 0cfm, detectors are required. In multi-story buildings at each story with a commonly shared return and having a capacity greater than 10CFM’s. 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. 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. 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. Fully Customizable Ducts. A Cleaner, More Cost-Effective, Energy Efficient Alternative to Metal Duct work.

At Kele we make it easy to find the right Gas and Specialty Sensors product. In most air return ducts, the duct smoke detector is placed after all air inlets, and before any filters, fresh air inlets or fans. On the supply side, the duct smoke detector is placed after the fresh air inlet, filter, conditioning area, and fan.

Therefore, filters would not be a factor. 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. Model can accommodate exposure to wide humidity and temperature ranges, plus detector comes with highly visible status. Duct smoke detectors required in air-moving systems shall transmit an alarm signal to either: (1) the fire alarm panel which is supervising the building fire sprinkler system and valve tamper.

The flexible housing of the duct smoke detector fits multiple footprints from square to rectangular. The detector shall be listed for the air velocity, temperature and humidity anticipated at the point where it is installed. The surveyor says the smoke must be inserted feet prior to duct detector to test the actual tube for blockages.

This new duct smoke detector senses airflow speeds ranging from 1to 0feet per minute with proven System Sensor precision. If smoke is detecte the device will close dampers, stop fans and blowers, and trigger an audible and visible signal at the fire control panel, Kapparos explains. 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. A Light Emitting Diode (LED) shines light into a black chamber so its light will be absorbed by the inside black walls.

The device address is set using the two rotary switches located on the front of the unit. One device address is required. The detector is capable of performing comprehensive self-diagnostics and storing the. To zoom in, use the keyboard to focus on the arrow icon within the product image. Once it receives focus, use the arrow keys on the keyboard to move and position the product image.

The zoom feature provides no benefit to users who are blind. The DNRW duct smoke detector, with its NEMA rating, is Listed as a watertight enclosure providing protection against falling dirt, rain, and windblown dust, splashing and hose directed water. These features allow operators to use the detector in the most extreme environments. The unit is designed to prevent the recirculation or spread of smoke by air handling systems, fans, and blowers.

The ac tuation of a duct smoke detector shall ac tivate a vis ible and au dible su pervisory sig nal at a con stantly at tended lo cation. The duct smoke de tectors shall be con - nected to a fire alarm sys tem.