The CO2 tank appears to be empty. None of the air nozzles are working
All taken care of.
They empty because people use them to clean parts, not put out fires
Thank you @bhauber Joshua H. and @EthanWestern for switching out the tank. Old tank by the exit to refill.
FYI. Spare tank was stored in the Electrical Room (it took a bit to track down).
Thank you Brian and Joshua too for testing the CO2 before using and reporting the problem so we could fix.