I'm not even sure where to post this so here goes... I have access and permission to use a FD SCBA air compressor, certified for "GGA 7.1 grade E air, with additional moisture test" and access and permission to use a Medical oxygen cascade system. I am interested in getting proper training on o2 cleaning, and Nitrox blending, but first, before I bother, my question, is this grade of air (CGA 7.1 Grade E) suitable for Nitrox blending. NOT to worry, I will not attempt any mixing until i am properly trained. (i fill my air scuba tanks all the time currently)