General safety precautions should be followed when servicing compressed gas connections.
There are several things to note with cryogenic exhaust gases. First, the amount of exhaust our platforms expel is minimal. As compared to a chamber they are much smaller and more efficient with the use of the cryogenic liquid coolant. Also, the platforms are expelling exhaust only during the cooling cycle, or periodically during cold soaks to maintain temperature. So, generally speaking, the amount of exhaust expelled from one platform is not enough to cause any issues with the safety of the breathable air. Even several platforms in a normal size room with the usual typical venting found in most buildings would unlikely ever cause a problem. You would have to have many platforms in a small unvented room to ever cause concern.
With L-N2, the exhaust is nitrogen gas which is 80% of the normal air we breathe every day. The only concern with that exhaust is oxygen displacement, where so much nitrogen gas might be expelled that the oxygen levels reach unsafe low limits. This can easily be monitored with an O2 detector which doesn’t cost that much if there is a concern.
With L-CO2, the exhaust is carbon dioxide which of course is not something you want to breathe in high concentrations. As stated above, it would take many platforms before that becomes an issue.