| 摘要 |
<p>An axial fan assembly is provided for a ventilation assembly such as a commercial/industrial extractor fan assembly, or an underground car park exhaust system, the fan assembly (23) comprising a fan duct (25) and two casing halves (27) which encase the fan duct in use. The fan duct comprises a circular cross section metal tube formed from a metal spinning process whereby the wall of the tube is formed from continuous material having no seam or joint. The fan duct is adapted to house a fan (35) comprising a fan impeller (37) and a fan motor (39), the two casing halves (27) each comprising a first diameter portion (29) of the same diameter as the metal tube of the fan duct and a wider diameter portion (33). Each casing half is also formed from a metal spinning process whereby the wall of each casing half is formed from continuous material having no seam or joint.</p> |
