Fan control works well and does not trip the PSS
However the differential pressure does trip the detector gas system and the system will not reset while the fan is on. (The fan was only on for 5 min so it was a short test)
As soon as the fan was turned off (10 seconds) the gas system differential pressure switch was reset.
Due to this question the fans should not be used without the concurrence of Hall A management.
A copy of this log entry has been emailed to: okay@jlab.org,