| 摘要 |
<p>The present invention relates to a roof ventilation apparatus which uses the energy of the wind to induce exhaust air from the roof void. In one aspect, the apparatus comprises a substantially upright and circular ventilation duct for the communication of air between an interior and an exterior of the enclosed space, the assembly further comprising a circular body supported above the duct, and a shroud surrounding and spaced apart from the body at least, so as to define a body encircling gap between the body and the shroud.</p> |
