Patent ID: 8128465

Claim:
An air displacing device for transferring air from a first location to a second location, the air displacing device comprising: a housing including a fan, and the fan being contained within a fan chamber; a prime mover for rotating the fan; an air inlet to the housing for enabling the device to receive air from the first location; an air outlet from the housing for delivering air to the second location; and a duct for transferring air through the housing from the inlet to the outlet via the fan chamber, the fan being operable by the prime mover for causing the air to be displaced along the duct from the inlet to the outlet, and the housing having a fixed section having a plurality of walls extending outward in a first direction, distal ends of the plurality of walls serving to define a datum plane; wherein the housing has a displaceable member for displacement between a first, standby, configuration where the projection of the displaceable member from the datum plane is a minimum and so that a volume of the housing is a minimum, and a second, working, configuration where the projection of the housing from the datum plane is a maximum and so that the volume of the housing is a maximum; and the fan chamber includes a scroll section forming at least part of a wall of the fan chamber, the scroll section mounted on a pivot so that when the displaceable member is in its first, standby, configuration, the scroll section is retracted and, when the prime mover drives the fan, air displaced by the fan causes the scroll section to extend and drive the displaceable member into its second configuration.