| 摘要 |
A ventilating apparatus for a building comprises a plurality of upper ducts (16n,e) each having upper and lower ends, the upper ends in use being open to the outside of the building and facing in different generally horizontal directions. In a bi-directional version of the apparatus, it also includes: a supply duct (26) and an extraction duct (28a,b), each having upper and lower ends, the lower ends in use being open to the inside of the building; a damper arrangement (32) operable to connect the upper ends of each of the supply duct and the extraction duct selectably to the lower end(s) of one or more of the upper ducts; a sensor (46) for sensing, in use, wind direction outside the building; and a controller for controlling the damper arrangement in dependence upon the sensed wind direction. Unidirectional versions of the apparatus are also disclosed. With each version, when the wind blows, the direction of air flow in the supply duct and/or the extraction duct is predictable. |
