How well do you know the installation and testing requirements for duct smoke detectors? This quiz is based on the 2019 NFPA 72, 2018 NFPA 90A and 2018 International Building Code (IBC).
Created by: Thomas P. Hammerberg
1. You are allowed to use a remote test switch for testing duct smoke detectors to meet the requirements of NFPA 72.
2. In accordance with NFPA 90A, smoke detectors listed for use in air distribution systems shall be located downstream of the air filters and before any branch connection in air supply systems having a capacity ______.
A. 2,000 cubic feet per minute (cfm) or greater
B. greater than 2,000 cfm
C. 15,000 cfm or greater
D. greater than 15,000 cfm
3. In accordance with the IBC, duct smoke detectors are only required in the main return air or exhaust air plenum, not on the supply side.
4. Detectors that are installed in the supply air duct system ______ as a substitute for open area protection.
A. are permitted to be used
B. are not permitted to be used
5. In accordance with NFPA 90A, if you have multiple air handlers servicing a common area that collectively, but not individually, exceeds the minimum air volume required, you are required to install duct smoke detectors on each of them.
6. If you must install smoke detectors at a 36-in.—high-by-72-in.-wide opening where the return air enters the common return air system, how many detectors listed for the air velocity must be installed?
7. In accordance with NFPA 90A, smoke detectors are required to be installed on the return side of the air handler unit when the capacity is greater than ______ and the air handler serves ______ story.
A. 2,000 cfm, one story
B. 2,000 cfm, more than one story
C. 15,000 cfm, one story
D. 15,000 cfm, more than one story
8. If duct smoke detectors are installed downstream of any filters, the primary purpose of the detector shutting down
the air handler is ______. (Choose two.)
A. o prevent smoke in the building from spreading to other smoke compartments
B. to prevent smoke from a fire outside of the building from entering
C. to protect occupants from smoke spread from a fire in the air handler unit (fan, filters, etc.)
D. to prevent unwanted alarms from air handler heaters turning on.
9. The sampling tube of a duct smoke detector must extend through the side of the ductwork on ducts more than ______ inches wide.
10. In Group R-1 and R-2 occupancies, a smoke detector is allowed to be used in each return air riser carrying not more than ______ cfm and serving not more than ______ air-inlet openings.
A. 2,000, 5
B. 2,000, 10
C. 5,000, 10
D. 15,000, 15