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716.3.3.2 Smoke damper actuation.
The smoke damper shall close upon actuation of a listed smoke detector or detectors installed in accordance with Section 907.3 and one of the following methods, as applicable:
   1.   Where a smoke damper is installed within a duct, a smoke detector shall be installed in the duct within 5 feet (1524 mm) of the damper with no air outlets or inlets between the detector and the damper. The detector shall be listed for the air velocity, temperature and humidity anticipated at the point where it is installed. Other than in mechanical smoke control systems, dampers shall be closed upon fan shutdown where local smoke detectors require a minimum velocity to operate.
   Exceptions:
      1.   Duct smoke detectors will not be required at each fire smoke damper where the supply fan shall shut down and all the fire smoke dampers associated with the supply system automatically close upon actuation of an automatic alarm initiating device on the floor(s).
      2.   Duct smoke detectors will be required within 5 feet (1524 mm) downstream of any electric duct reheat coil.
      3.   Non-ducted return air systems shall have a smoke detector located within 5 feet (1524 mm) upstream of each return air protected opening in a 2 hour fire rated barrier.
      4.   Ducted return air systems shall have a duct smoke detector located within 5 feet (1524 mm) of a smoke damper; additional smoke detectors will not be required at fire smoke dampers located downstream where there are no additional return air inlets.
   2.   Where a smoke damper is installed above smoke barrier doors in a smoke barrier, a spot-type detector listed for releasing service shall be installed on either side of the smoke barrier door opening.
   3.   Where a smoke damper is installed within an unducted opening in a wall, a spot-type detector listed for releasing service shall be installed within 5 feet (1524 mm) horizontally of the damper.
   4.   Where a smoke damper is installed in a corridor wall, the damper shall be permitted to be controlled by a smoke detection system installed in the corridor.
   5.   Where a total-coverage smoke detector system is provided within areas served by a heating, ventilation and air-conditioning (HVAC) system, smoke dampers shall be permitted to be controlled by the smoke detection system.
   6.   Smoke dampers that are part of an engineered smoke control system shall be controlled in accordance with Section 607.3.3.2 of the New York City Mechanical Code.