All Laser Cutters want two additional gadgets which move air: blower which removes surroundings / extracts smoke from machine and air compressor as a source for Air Compressor For Tire Production Equipment compressed atmosphere for so called atmosphere assist.
Why and How
Laser cuts by 
heat, very high warmth 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 material / edges and can even escape control causing serious emergency.
Fire needs atmosphere to burn nonetheless it will 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 atmosphere is extruded straight at the laser mind in a very limited stream and is directed at the place where laser touches material.
Pressure and volume of air
Pressure of air is key variable for air support efficienty, inside our shop we found out that optimal value is between 2 and 3.5 bar (31-50psi).
To accomplish required pressure compressor must push certain volume of air through air flow assist opening, exact volume depends upon size of the opening and desired pressure. Top quality laser cutter heads have small and finely tuned openings while cheaper chinese cutters just blow in general direction via large holes.
Proper compressor
When choosing compressor you need to consider if it can constantly provide desired pressure and volume of air. Little airbrush compressors small compressors boast amazing pressure figures but really poor flow rates sufficient only for airbrush pistols. Even if small compressor can push enough air it will likely overheat in short while.