Patent ID: 6764277
Filing Date: 2004-07-20
Classification: F04D,F24F

Abstract:
A fan guard (18) of a ventilation unit (10) that is mounted in an air discharge port (17) of the ventilation unit (10) having a ventilation fan (15), the fan guard 18 comprising:an outer frame (26) mounted in the outer circumference of the air discharge port (17); a plurality of first ribs (27) that are formed such that they are curved in the rotational direction of the ventilation fan (15) and radiate outward toward the outer frame 26 in the radial direction from the vicinity of a central member of the outer frame (26); and a plurality of second ribs (28) that are integral with the first ribs (27), concentrically disposed at a predetermined spacing in the radial direction from the rotational axis of the ventilation fan (15), and formed such that those in the outer circumference are slanted toward the outer radial direction to follow the flow of blown air from the ventilation fan (15), while those in the inner circumference are not slanted.