Duct Detector Remote Test Switch Requirements

Duct detectors smoke detection nfpa 90a code requirements in air supply systems with a capacity greater than 2000 cfm s downstream of the air filters and upstream of any branch ducts.

Duct detector remote test switch requirements.

Engineering specifications the air duct smoke detector shall be silent knight model sd505 ductr and remote test switch shall be sd505 dts k. At these locations air flow is less turbulent and the air smoke mixture should be more homogenous refer to nfpa 90a 72 and 101 for more information. 4 8 h 2 90 w 1 4 d weight. 2 8 to 32 vdc 12 ma max.

The housing shall contain a silent knight model sd505 aps photoelectric smoke sensor. Yes if the duct detector cannot be reset at the facp or annunciator then a separate test reset station will need to be installed for resetting the duct detector per nfpa 72 section 23 8 5 4 6 4. The duct detector shall be of metal construction. Refer to detector installation instructions for additional information.

Power requirements alarm led. 10 va 32 vdc alarm response time. Test switch 10 va 32 vdc reset switch 10 va 32 vdc alarm response time 40 seconds max. 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.

In multi story buildings at each story with a commonly shared return and having a capacity greater than 15 000 cfm s.