the impeller housing 84 the flexible sealing member inhibits the return of air to the air inlet member 90 along a path extending between the outer casing 16 and the impeller housing 84 by separating the primary air flow drawn in from the external environment from the air flow emitted from the air outlet 92 of the impeller 52 and the diffuser 80 the sealing member preferably comprises a lip seal 98 the sealing member is annular in shape and surrounds the impeller housing 84 extending outwardly from the impeller housing 84 towards the outer casing 16 in the illustrated embodiment the diameter of the sealing member is greater than the radial distance from the impeller housing 84 to the outer casing 16 thus the outer portion 100 of the sealing member is biased against the outer casing 16 and caused to extend along the inner face of the outer casing 16 forming a seal the lip seal 98 of the preferred embodiment tapers and narrows to a tip 102 as it extends away from the impeller housing 84 and towards the outer casing 16 the lip seal 98 is preferably formed from rubber the sealing member further comprises a guide portion 104 for guiding a power connection cable 106 to the motor 56 the guide portion 104 of the illustrated embodiment is formed in the shape of a collar and may be a grommet the electrical cable 106 is in the form of a ribbon cable attached to the motor at joint 108 the electrical cable 106 extending from the motor 56 passes out of the.