These Jet fans are used to move air inside garages to prevent smoke from reaching people by taking air in two ways: mechanically through fresh air fans or through natural ventilation through the car inlet(Ramp) and starting to move the smoke towards the Exhuast fans that throw the smoke outside the building. We use Jet fans when the garage area is large and we are afraid that if a fire breaks out in an area far from the Exhuast fans, the smoke will remain in the area and harm people.