The fire safety plan for WTC 1 and WTC 2 (PANYNJ 1995) defines smoke purge as the removal of smoke and other gaseous combustion products from the (fire) area "after a fire has been extinguished.
Based on the information contained in the fire safety plan for WTC 1 and WTC 2 and WTC Instruction Manual No.
Operation of the smoke management system for WTC 1 and WTC 2 could be achieved by controlling the equipment within the individual MERs or at a central control panel located in the Operations Control Center (OCC) located on the B1 level of WTC 2.
Because WTC 1 and WTC 2 were fully retrofitted with automatic sprinklers, smoke and heat venting and/or stair pressurization was not required in WTC 1 and WTC 2 on September 11, 2001.
WTC 1 and WTC 2 were equipped throughout with fire dampers at duct penetrations into vertical shafts, consistent with the Building Code of New York City (BCNYC) (New York City 1968).
While one account summarizing the building restoration activities following the 1993 bombing suggested that emergency power was provided for smoke purge fans, the Port Authority stated that emergency power was not provided to WTC 1 and WTC 2 base building smoke purge fans.
The following discussion documents the normal operation of the fully functional smoke management systems and their impact on smoke conditions in WTC 1 and WTC 2 on September 11, 2001.
The smoke management systems in WTC 1 and WTC 2 were designed to provide a manually-initiated smoke purge function.
Was the smoke purge system in either WTC 1 or WTC 2 manually initiated by emergency response personnel?