Teryair pneumatic portable ventilation fans are compressed air driven ventilators that can be used with or without a duct in hazardous areas such as cooling tanks or hatches. They provide ventilation of gas, paint fumes and other hazardous fumes. The blades of this exhaust fan is aerodynamically designed so as to ensure that the blades can move optimum amount of air. The pneumatic flow fans are mainly design for high anti-hazardous classification areas. It uses the power from air compressor system to drive the air motor fan into high speed, hence giving air ventilation. This works to bring fresh air from the outside and into the enclosed space. It helps circulate air through the building or home, which prevents individuals from breathing stuffy, less oxygenated air.