Angel AIR wil work with any marker that can run on air. As a matter of fact, it isn't even called Angel AIR, but A.I.R., people just call it Angel AIR, cause it's made by WDP.
If you want to run your Impy on air, I don't think you need to change anything on the marker itself.
Did you get just the Impy, or did you get it with the Max-Flo set up?