How Many CFM of Dust Collection Does a CNC Router Need?

An ideal CFM(Cubic Feet Per Minute) range needed for a CNC router is 1000 cubic feet per minute (CFM) for finer dust collection, whereas 350 CFM is fairly good for chip collection, especially in the woodworking shops. 

If you use a beginner-level compact CNC device in your workshop, then small dust collectors are fine enough and can clear only half of the volume of air required to capture finer dust particles from larger work environments. 

Air volume per minute in Cubic feet basically indicates how much area of work space we can collect the dusty air from. So, the bigger the hood we need to collect dust, the more volume of air required. It is better to use a shop vac that has an upgraded hood and an ability to provide twice the air volume to collect heavier dust particles and chips. This type of setup applies for both small and commercial scale CNC router workshops.

According to experts, the ideal CFM range for any larger DIY CNC workshop should be around 792 CFM rounding it up to 800 CFM for even better dust collecting experience. The ultimate motive should be to keep the work area clean as long as possible so that it is healthy for the worker to exist longer in that work setting without any respiratory disturbance. Though it may not fully clean the environment of dusty air particles, it will provide air cushioning to a good extent.

Another thing that relates to CFM is the air speed. Faster air movement means better extraction of dust from the work area. But most shop ductings are done in a manner that fails to keep the air moving faster. Air speed Feet Per minute (FPM) demonstrates how heavier chips you can pick up. 

According to the air engineering experts, they found that it is important to keep the air speed somewhere between (3700 to 3800) FPM to be able to collect heavier chips produced while doing heavy metal cutting operations. Another reason for the high FPM requirement is to prevent the dust collector duct from clogging with heavy chips. 

In horizontal duct, the air speed should be between (2500 to 2700) FPM and should be minimum 3800 FPM in the vertical duct runs. To stay on the better side, air engineers recommend keeping the ducting systems to run at 4000 FPM for better cushioning.

The Edge Cutter is reader-supported website. When you buy through links on our website, we may earn an affiliate commission.

Leave a Comment