All Laser Cutters need two additional products which move air: blower which removes air flow / extracts smoke from machine and air flow compressor as a source for compressed air flow for so called air flow assist.
Laser cuts by 
high temperature, very high heat focused in tight beam. Side items of high heat are smoke and fire, both are not welcomed addition, smoke disperses laser reducint it's efficienty and fire causes charring of materials / edges and may even get out of control causing serious emergency.
Fire needs air flow to burn Laser Cutting Air Compressor nonetheless it can also die if you blow too hard, think of a candle in the wind. This is essentialy what air flow assist is usually for: compressed air flow is extruded straight at the laser mind in a very tight stream and is fond of where laser touches material.
Pressure of surroundings is key variable for air assist efficienty, in our shop we found out that optimal worth is between 2 and 3.5 bar (31-50psi).
To attain required pressure compressor must push certain volume of air through air assist opening, exact volume depends upon size of the opening and desired pressure. High quality laser cutter heads have small and finely tuned openings while cheaper chinese cutters just blow in general direction via huge holes.
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