All Laser Cutters want two additional devices which move surroundings: blower which removes surroundings / extracts smoke from machine and air flow compressor as a source for compressed surroundings for so called air assist.
Why and How
Laser cuts by temperature, very high temperature 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 will even escape control causing serious emergency.
Fire needs surroundings to burn but it will also die if you blow too hard, think about a candle in the wind. That is essentialy what air assist is definitely for: compressed surroundings is extruded directly at the laser mind in a very limited stream and is directed at where laser touches material.
Pressure and level of air
Pressure of air flow is essential variable for air aid efficienty, inside our shop we found out that optimal worth is between 2 and 3.5 bar (31-50psi).
To achieve required pressure compressor must push certain volume of air through atmosphere assist opening, specific volume depends upon size of the starting and desired pressure. High quality laser beam cutter heads have small and finely tuned openings while cheaper chinese cutters simply blow generally direction via huge holes.
Proper compressor
When choosing compressor you 
should consider if it will be able to constantly provide desired pressure and level of air. Small airbrush compressors little compressors boast impressive pressure figures but https://www.ever-power.net/?s=laser+cutting+air+compressor&post_type=product actually poor flow rates enough only for airbrush pistols. Actually if small compressor would be able to push enough air it’ll likely overheat in short while.