Abstract: An apparatus for ventilating an enclosed area comprised of a hemispherical dome-like head assembly covering an exit hole to an enclosed area to be ventilated, an external wind driven fan, and high efficiency internal exhaust fan blades adjacent to the exit hole being coupled to the wind driven fan. The external and internal fans are designed to be separated by the hemispherical dome-like covering over a vent tube and operate in conjunction with one another but are functionally independent. The high efficiency specially configured internal fan provides power to exhaust the air while the external fan provides the driving force. The external fan is provided by a series of vanes or fins on the external surface of the hemispherical dome-like covering while the internal fan is provided in the form of a series of specially configured fan blades beneath the hemispherical dome-like covering.