All Laser Cutters want two Air Compressor For Tire Production Equipment additional gadgets which move surroundings: blower which removes air flow / extracts smoke from machine and surroundings compressor as a source for compressed atmosphere for so called surroundings assist.
Why and How
Laser cuts by heat, very high high temperature 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 get out of control leading to serious emergency.
Fire needs surroundings to burn but it will also die if you blow too hard, think about a candle in the wind. That is essentialy what air flow assist is for: compressed air is extruded straight at the laser head in a very tight stream and is fond of where laser touches material.
Pressure and volume of air
Pressure of air flow is key variable for air help efficienty, in our shop we discovered that optimal value is between 2 and 3.5 bar (31-50psi).
To attain required pressure compressor needs to push certain level of air through atmosphere assist opening, exact volume depends on size 
of the starting and desired pressure. High quality laser cutter heads have small and finely tuned openings while cheaper chinese cutters simply blow generally direction via large holes.
Proper compressor
When choosing compressor you should consider if it will be able to constantly provide desired pressure and level of air. Little airbrush compressors little compressors boast impressive pressure figures but really poor flow rates enough only for airbrush pistols. Also if small compressor can push enough air it will likely overheat in short while.