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