Fan VH9
A full size stainless steel frame mounting 9 HP four-stroke engine and a wooden propeller. When you want to move the fan the wheels fold under and, when the fan is being used the wheels can be folded out to prevent the fan moving and to angle the blade wash into the mouth of the envelope.
Fan VH13
A more powerful option for balloon sizes of 6000 m3 (210,000 cuft) and larger. Very similar construction to the VH9 with a 13 HP engine.