All Laser Cutters require two additional devices which move atmosphere: blower which removes air flow / extracts smoke from machine and atmosphere compressor as a source for compressed atmosphere for so called surroundings assist.
Laser cuts by temperature, very high heat focused in tight beam. Side items of high heat are smoke and fire, both aren’t 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 surroundings to burn but it can also die in the event that you blow too hard, think about a candle in the wind. This is essentialy what surroundings assist is usually for: compressed air flow is extruded straight at the laser head in a very restricted stream and is directed at where laser touches material.
Pressure of air is key adjustable for air support efficienty, inside our shop we found out that optimal worth 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 starting and 
desired pressure. Top quality laser cutter heads have small and finely tuned Laser Cutting Air Compressor openings while cheaper chinese cutters simply blow generally direction via huge holes.