I've done it tons of times at where I work (since sometimes there's so much dust in machines I've worked on, it'd be a waste to use canned air xD). Just make sure no water (from condensation) comes out of the nozzle when spraying (hold the nozzle out at like concrete or something, spray the air at the ground, and see if any moisture comes out). If nothing comes out (except air obviously) then you're golden.