DYNA adds and hangs external filter. Dust and impure substance in the air filtered at first stage, it effectively reduce the pollution sources be admitted into the machine. The internal is always kept clean and lengthen durability of consumptive parts.
Realistic state analysis.
Dust of atmosphere once enter the unit through compresson, it may be running to any part randomly with the oil. It will cause load in the system. The durability of consumptive part shortened.