Patent ID: 9458860
Filing Date: 2016-10-04
CPC Classification: F01N,F04D,F24F

Claim Text:
1. A fan with a sound muffling box, comprising: a box having a box inlet port and a box outlet port located on opposite sides from each other; a double-suction centrifugal fan encased in the box, the double-suction centrifugal fan including: a sound insulating board disposed on the box inlet port, the sound insulating board being disposed at a position to hide a portion of the opposite-to-motor-side inlet port when an inside of the box is viewed from the box inlet port, the sound insulating board dividing the box inlet port into plural regions, wherein the sound insulating board increases in area from a near side of the motor-side inlet port toward a far side of the motor-side inlet port.