compressed air in electrical panels

[Gage]

I couldn't imagine so considering almost every machine I work on has something similar to this going on

 

[Knobhead]

I’ve worked on 41 kilns and furnaces of various types over the years. Panels could contain flammable gas, noxious gas, hydraulic pressure and you’re worried about a bit of compressed air?

All panels had a reference number not warning notices. If you didn’t know what was in there, you wouldn’t be on the plant.