Here are some “rule of thumb” numbers on cubic feet per minute (cfm) used to remove dust from machinery. For example, a press takes 350 cfm, where a radial arm saw would take 400-500 cfm. A planer could use 350 cfm, also. The sander is also at 350. As you can see, if one or more pieces are up and running at the same time, the demand can add up fast. This an important factor when setting up a dust collecting system.