Abstract: A jet fan arrangement for ventilating tunnels and the like in which the axis of the fan is positioned at an angle to the supporting surface so as to blow air away from the supporting surface. When the flow of air through the fan is reversed, the angle of inclination of the axis of the fan is automatically changed so that the direction of flow of air remains away from the supporting surface.
Type:
Grant
Filed:
February 24, 1997
Date of Patent:
March 3, 1998
Assignees:
South Bank University & Enterprises, Limited, Woods of Colchester Limited