Question: how big air compressor do i need?
Answer: Examples. Single tool use: If a 1/2" impact wrench requires 5.0 CFM @ 90 PSI, then the compressor should deliver between 6.25 - 7.5 CFM @ 90 PSI. Multiple tool use: If you plan to run more than one tool at the same time, you must add the CFM of each tool together to determine your needs.