Patent ID: 8205401

Claim:
A cover for a tubular duct extending from a planar roof surface, the cover comprising: a cap portion disposed, in use, in spaced relation to said tubular duct, to define a headspace to which said tubular duct extends and an annular space surrounding the headspace; a peripheral outer skirt extending in use from a rim of the cap portion in surrounding, spaced relation to said duct; and a closure element which extends in use from a terminus of the outer skirt to said duct and is disposed in spaced relation to said roof surface, the peripheral outer skirt and the closure element having vanes formed therein, the vanes being oriented such that: precipitation driven by wind through the outer skirt into the interior of the cap portion is directed, as it passes through the outer skirt, towards the roof; and precipitation driven by wind through the closure element into the interior of the cap portion is directed, as it passes through the closure element, away from the duct.