Patent ID: 7434608

Claim:
An air-blowing unit comprising: a unit including an irreversible fan, an air inlet port, and an air discharge port; a first blower-side duct having a first end and an opposite second end, the first end of the first blower-side duct being connected to said air inlet port; a second blower-side duct having a first end and an opposite second end, the first end of the second blower-side duct being connected to said air discharge port; a first air opening-side duct having a first end and an opposite second end, a first air opening being disposed at the second end thereof, said first air opening leading to a space external to the air-blowing unit; a second air opening-side duct having a first end and an opposite second end, a second air opening being disposed at the second end thereof, said second air opening leading to said external space; and an air passage switching device disposed between the second ends of said blower-side ducts and the first ends of said air opening-side ducts, said air passage switching device being adapted to switch an air passage connection between said second ends of said blower-side ducts and said first ends of said air opening-side ducts; wherein said air passage switching device includes a first flexible duct and a second flexible duct, a first end of said first flexible duct being fixed to the second end of said first blower-side duct and a first end of said second flexible duct being fixed to the second end of said second blower-side duct, wherein said air passage switching device further includes a movable member, adapted to move the positions of a second end of said first flexible duct opposite to the first end of the flexible duct and a second end of said second flexible duct opposite to the first end of the flexible duct, and wherein, when said air passage switching device is switched to a first mode, said movable member moves to the position where the second end of said first flexible duct is matched with the first end of said first air opening-side duct, and the second end of said second flexible duct is matched with the first end of said second air opening-side duct, and when said air passage switching device is switched to a second mode, said movable member moves to the position where the second end of said first flexible duct is matched with the first end of said second air opening-side duct, and the second end of said second flexible duct is matched with the first end of said first air opening-side duct.