All Laser Cutters need two additional gadgets which move atmosphere: blower which removes air / extracts smoke from machine and surroundings compressor as a https://www.ever-power.net/?s=laser+cutting+air+compressor&post_type=product source for compressed atmosphere for so called air assist.
Why and How
Laser cuts by high temperature, very high heat 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 material / edges and will even escape control leading to serious emergency.
Fire needs surroundings to burn but it can also die in the event that you blow too hard, think about a candle in the wind. That is essentialy what air flow assist is certainly for: compressed atmosphere is extruded directly at the laser mind in a very tight stream and is directed at the place where laser touches material.
Pressure and level of air
Pressure of surroundings is essential variable for air aid efficienty, inside our shop we discovered that optimal value is between 2 and 3.5 bar (31-50psi).
To achieve required pressure compressor must push certain level of air through atmosphere 
assist opening, precise volume depends on size of the opening and desired pressure. Top quality laser beam cutter heads have small and finely tuned openings while cheaper chinese cutters just blow in general direction via huge holes.
Proper compressor
When choosing compressor you need to consider if it can constantly provide desired pressure and volume of air. Small airbrush compressors small compressors boast amazing pressure figures but really poor flow rates enough limited to airbrush pistols. Also if small compressor can push enough air it’ll likely overheat in short while.