All Laser Cutters need two additional devices which move air flow: blower which removes air / extracts smoke from machine and air flow compressor as a source for compressed air for so called atmosphere assist.
Laser cuts by temperature, very high Laser Cutting Air Compressor temperature focused in tight beam. Side items of high temperature are smoke and fire, both are not welcomed addition, smoke disperses laser beam reducint it’s efficienty and fire causes charring of materials / edges and may even escape control leading to 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 flow assist is for: compressed atmosphere is extruded directly at the laser head in a very limited stream and is directed at where laser touches material.
Pressure of air flow is key variable for air support efficienty, in our shop we discovered that optimal worth is between 2 and 3.5 bar (31-50psi).
To attain required pressure compressor must push certain volume of air through atmosphere assist opening, exact volume depends on size of the starting and desired pressure. High quality laser cutter heads have little and finely tuned openings while cheaper chinese cutters just blow generally direction via large holes.