What is the difference between smoke detector and duct detector?
What is the difference between smoke detector and duct detector?
NFPA 72 also states that a duct smoke detector is not allowed to replace an area smoke detector, mainly because if the air-handling unitair-handling unitAn air handler, or air handling unit (often abbreviated to AHU), is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system.https://en.wikipedia.org › wiki › Air_handlerAir handler - Wikipedia (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.
Does a make up air unit require a duct smoke detector?
It is true that with most traditional recirculating air distribution systems, installation of an HVAC smoke detector is required. ... Cambridge Air Solutions systems, including make-up air units, ventilation systems and industrial heaters use only 100-percent outdoor air to heat and ventilate.Feb 16, 2021
What is HVAC fire alarm system?
Instead, an HVAC fire alarm is part of a greater system of fire and smoke detectionsmoke detectionSmoke detectors are usually housed in plastic enclosures, typically shaped like a disk about 150 millimetres (6 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary. Smoke can be detected either optically (photoelectric) or by physical process (ionization).https://en.wikipedia.org › wiki › Smoke_detectorSmoke detector - Wikipedia that helps keep your building and its residents safe. Duct smoke detectors can only detect smoke that enters the ductwork, meaning the air must be laden with smoke before the system reacts.Oct 15, 2020
Where do you put a duct detector?
Installation guidelines Install the duct smoke detector on a flat section of HVAC duct between six and ten duct widths from any bends or obstructions. Install supply-side detectors at a point downstream from the supply fan and after the air filter.
Can a duct detector be used as an area smoke detector?
It is not a substitute for an area smoke detector. It is not a substitute for early warning detection. It is not a replacement for a building's regular fire detection systemfire detection systemThe first automatic electric fire alarm was patented in 1890 by Francis Robbins Upton, an associate of Thomas Edison. George Andrew Darby patented the first European electrical heat detector in 1902 in Birmingham, England. In the late 1930s, Swiss physicist Walter Jaeger tried to invent a sensor for poison gas.https://en.wikipedia.org › wiki › Smoke_detectorSmoke detector - Wikipedia. International Fire Code states, “Detectors that are installed in the air duct system shall not be used as a substitute for open air protection.”
How does a duct smoke detector work?
How Do They Work? Duct detectors sample currents in the air handling equipment to determine if smoke or fumes are present. If smoke is detected, the device will close dampers, stop fans and blowers, and trigger an audible and visible signal at the fire control panel, Kapparos explains.Feb 21, 2013
Where are duct detectors required?
NFPA 90A requires duct detectors to be installed on the supply side of air handler units with airflows of more than 2,000 cubic feet per minute (cfm). The standard also requires a duct detector on the return side of any unit with air flows exceeding 15,000 cfm and which serve more than one floor of a building.Dec 10, 2020
What are the 3 types of smoke detectors?
There are three types of smoke alarms, ionization, photoelectric and a combination of the two which is commonly called a “dual” detector.
Where are duct smoke detectors required?
The International Mechanical Code requires a duct smoke detector in the return for units over 2000 cfm and requires a detector in the supply duct for systems over 15,000 cfm. Many designers require duct detectors in the supply and return in an attempt to meet both conflicting requirements.
Where are duct detectors located?
Duct detectors located on the return side and upstream of any filters or introduction of outside air detect smoke coming from an air conditioned space.
Are duct smoke detectors required on exhaust fans?
Duct-mounted smoke detectors, however, are not required in a return air system if the spaces served by the HVAC system are protected by ceiling-mounted smoke detectors. Duct-mounted smoke detectors are also not required downstream of exhaust fans.Oct 1, 2007
Should I put a smoke detector in the furnace room?
For best performance, AVOID installing Smoke Alarms in these areas: Where combustion particles are produced. Combustion particles form when something burns. Areas to avoid include poorly ventilated kitchens, garages, and furnace rooms.
How do you wire a smoke detector in a HVAC system?
https://www.youtube.com/watch?v=2z4edw_Vegc
How do you install a duct smoke detector?
To ensure correct operation, install the duct detector using the following guidelines: Install the duct smoke detector on a flat section of HVAC duct between six and ten duct widths from any bends or obstructions. Install supply-side detectors at a point downstream from the supply fan and after the air filter.