Bad hardware on door separating tunnel ventilating fan room outlet from intake. With the doors open, ventilating air is short-circuited from fan discharge to fan intake.

The two 30,000 cfm fans in the fan room provide vital air movement in the tunnel to prevent a worker from being enveloped in steam in case of an accident. The air movement carries the steam toward the vertical pipe risers at the ends of the tunnel providing a clear escape route back toward the Gentry Complex entrance where the fans are located. They should be considered and maintained as safety equipment as opposed to comfort ventilation. Currently both fans operate around the clock (although I am under the impression that both were inoperative at one time). The engineering drawings call for the fans to be temperature controlled.

Recommend door hardware be repaired and the control be modified to temperature control the fans when the tunnel is unoccupied, but run both fans when the tunnel is occupied.