All Laser Cutters want two additional products which move surroundings: https://www.ever-power.net/?s=laser+cutting+air+compressor&post_type=product blower which removes air / extracts 
smoke from machine and air compressor as a source for compressed air flow for so called air assist.
Why and How
Laser cuts by heat, very high heat focused in tight beam. Side items of high heat are smoke and fire, both aren’t welcomed addition, smoke disperses laser reducint it’s efficienty and fire causes charring of material / edges and will even escape control causing serious emergency.
Fire needs air flow to burn nonetheless it can also die if you blow too hard, think of a candle in the wind. That is essentialy what air assist is definitely for: compressed atmosphere is extruded directly at the laser mind in a very tight stream and is directed at the place where laser touches material.
Pressure and level of air
Pressure of atmosphere is key variable for air help efficienty, inside our shop we discovered that optimal value is between 2 and 3.5 bar (31-50psi).
To attain required pressure compressor must push certain level of air through atmosphere assist opening, exact volume depends on size of the opening and desired pressure. Top quality laser beam cutter heads have little and finely tuned openings while cheaper chinese cutters just blow generally direction via huge holes.
Proper compressor
When choosing compressor you need to consider if it can constantly provide desired pressure and volume of air. Little airbrush compressors little compressors boast impressive pressure figures but really poor flow rates enough limited to airbrush pistols. Also if small compressor can push enough air it’ll likely overheat in short while.