All Laser Cutters require two additional gadgets which move atmosphere: blower which removes air flow / extracts smoke from machine and surroundings 
compressor as a source for compressed air flow for so called atmosphere assist.
Laser cuts by high temperature, very high temperature focused in tight beam. Side items of high temperature are smoke and fire, both aren’t welcomed addition, smoke disperses laser beam reducint it’s efficienty and fire causes charring of materials / edges and will even escape control causing serious emergency.
Fire needs air to burn nonetheless it can also die if you blow too hard, think about a candle in the wind. This is essentialy what atmosphere assist can be for: compressed air is extruded directly at the laser head in a very limited stream and is fond of where laser touches material.
Pressure of air flow is key adjustable for air support efficienty, in our shop we discovered that optimal worth is between 2 and 3.5 bar (31-50psi).
To accomplish required pressure compressor needs to push certain volume of air through air assist opening, exact volume depends on size of the starting and desired pressure. Top quality laser beam cutter heads have little and finely tuned Laser Cutting Air Compressor openings while cheaper chinese cutters simply blow generally direction via large holes.
