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A fan includes a casing having an air inlet and an air outlet, an impeller housing located within the casing, an impeller located within the impeller housing for generating an air flow along a path extending from the air inlet to the air outlet through the impeller housing, a motor housing connected

A fan includes a casing having an air inlet and an air outlet, an impeller housing located within the casing, an impeller located within the impeller housing for generating an air flow along a path extending from the air inlet to the air outlet through the impeller housing, a motor housing connected to the impeller housing, and a motor located within the motor housing for driving the impeller. A bellows support is provided for mounting the impeller housing within the casing. The bellows support is disposed on a seat connected to the casing. The bellows support extends about the impeller housing and forms a seal between the impeller housing and the casing.

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1. A fan comprising: a casing having an air inlet and an air outlet;an impeller housing located within and surrounded by the casing;an impeller located within the impeller housing for generating an air flow along a path extending from the air inlet to the air outlet through the impeller housing;a mo

1. A fan comprising: a casing having an air inlet and an air outlet;an impeller housing located within and surrounded by the casing;an impeller located within the impeller housing for generating an air flow along a path extending from the air inlet to the air outlet through the impeller housing;a motor housing connected to the impeller housing;a motor located within the motor housing for driving the impeller;a bellows support of undulating shape for supporting the impeller housing within the casing, the bellows support being mounted on a seat connected to the casing, the bellows support extending about the impeller housing and forming a seal between an outer surface of the impeller housing and an inner surface of the casing; anda system for inhibiting rotation of the bellows support relative to the casing. 2. The fan of claim 1, wherein the bellows support is arranged within the casing so as to bear substantially evenly thereabout the weight of the impeller, impeller housing, motor and motor housing. 3. The fan of claim 1, wherein the bellows support comprises an upper annular end connected to the impeller housing, and a lower annular end mounted on the seat. 4. The fan of claim 1, wherein the bellows support comprises an annular sealing member extending thereabout for engaging the inner surface of the casing. 5. The fan of claim 4, wherein the sealing member comprises a lip seal. 6. The fan of claim 1, wherein the seat comprises a plurality of angularly spaced support surfaces and the system comprises at least one rotation inhibiting member connected to the bellows support and located between adjacent support surfaces. 7. The fan of claim 6, wherein the system comprises a plurality of said rotation inhibiting members each located adjacent a respective one of the adjacent support surfaces. 8. The fan of claim 1, wherein the bellows support is substantially co-axial with the impeller. 9. The fan of claim 1, comprising a system for inhibiting radial displacement of the bellows support relative to the casing. 10. The fan of claim 9, wherein the system comprises a collar connected to the bellows. 11. The fan of claim 10, wherein the seat surrounds the collar. 12. The fan of claim 1, wherein the seat extends radially inwardly from the inner surface of the casing. 13. The fan of claim 1, wherein the seat is integral with the casing. 14. The fan of claim 1, wherein the impeller housing comprises a shroud extending about and substantially concentric with the impeller. 15. The fan of claim 14, wherein the shroud has an outwardly flared lower end comprising an air inlet for receiving the air flow from the air inlet of the casing. 16. A fan comprising: a casing having an air inlet and an air outlet;an impeller housing located within and surrounded by the casing;an impeller located within the impeller housing for generating an air flow along a path extending from the air inlet to the air outlet through the impeller housing;a motor housing connected to the impeller housing;a motor located within the motor housing for driving the impeller;a bellows support of undulating shape for supporting the impeller housing within the casing, the bellows support being mounted on a seat connected to the casing, the bellows support extending about the impeller housing and forming a seal between an outer surface of the impeller housing and an inner surface of the casing; anda system for inhibiting radial displacement of the bellows support relative to the casing. 17. The fan of claim 16, wherein the system comprises a collar connected to the bellows. 18. The fan of claim 17, wherein the seat surrounds the collar. 19. The fan of claim 16, wherein the bellows support is arranged within the casing so as to bear substantially evenly thereabout the weight of the impeller, impeller housing, motor and motor housing.