Minimum of a 90 CFM compressor with a 3/4" chicago style air coupler.  In air compressors, the abbreviation "CFM" stands for cubic feet per minute, a measurement of the flow rate of a volume of air (not to be confused with "psi"). When using an pneumatic-powered tool connected to an air compressor, each tool has a minimum "CFM" rating for optimal operation.  Power Gun is a suction blast tool designed for dry abrasive blasting where the air supply is limited or the job is small. The tool is lightweight and compact and ideal where setting up a conventional pressure blast machine would be awkward or inconvenient. The Power Gun can be used with all common media to clean or etch metal, clean masonry, etch glass, and other durable surfaces.  The Power Gun handles most fine media suitable for blasting. Consult distributor for media recommendation. OSHA recommends against the use of abrasive containing more than 1% free silica.