All Laser Cutters want two additional gadgets which move air flow: blower which removes air flow / extracts smoke from machine and surroundings compressor as a source for compressed air for so called air flow assist.
Why and How
Laser cuts by temperature, very high temperature focused in tight beam. Side items of high temperature are smoke and fire, both are not welcomed addition, smoke disperses laser reducint it's efficienty and fire causes charring of materials / edges and can even escape control leading to serious emergency.
Fire needs atmosphere to burn nonetheless it can also die in the event that you blow too hard, think about a candle in the wind. That is essentialy what air assist is definitely for: compressed atmosphere is extruded straight at the laser mind in a very tight stream and is fond of the place where laser touches material.
https://www.ever-power.net/?s=laser+cutting+air+compressor&post_type=product Pressure and level of air
Pressure of air flow is essential variable for air assist efficienty, in our shop we discovered that optimal worth is between 2 and 3.5 bar (31-50psi).
To accomplish required pressure compressor must push certain level of air through atmosphere assist opening, specific volume depends on size 
of the opening and desired pressure. High quality laser beam cutter heads have small and finely tuned openings while cheaper chinese cutters just blow generally direction via huge holes.
Proper compressor
When choosing compressor you have to consider if it can constantly provide desired pressure and level of air. Little airbrush compressors little compressors boast impressive pressure figures but really poor flow rates enough limited to airbrush pistols. Also if small compressor would be able to push enough air it will likely overheat in short while.