| 摘要 |
PROBLEM TO BE SOLVED: To reduce the noise of air flow that is blown out of a blowing grill, and mechanical noise. SOLUTION: A plurality of side-blow holes 7, 7,... for blowing one portion (w) of blowing air flow W from an axial flow fan are formed at a cylindrical part 5a in a chimney-like bell mouth 5 that is formed on the top surface of a casing, thus blowing one portion (w) of the blowing air flow W sideways from the side-blow holes 7, 7,... and hence decelerating the flow rate of the air flow W passing through the blowing grill 4. |
