AIR CLEANING DEVICE Russian patent published in 2008 - IPC B04C5/20 

FIELD: engines and pumps.

SUBSTANCE: air cleaning device incorporates an air intake chambers arranged storied and provided with cyclones, sediment retaining flanges, a pipeline, a gas duct tapped from the pipeline and provided with manifolds fitted on its end, the manifolds being provided with hot air slots and connected to the air intake chambers. A transfer chamber is arranged between the pipeline and gas duct, while the gas duct being made up of step wisely expanding sections with the ratio of section areas between previous and subsequent sections not exceeding 2:1.

EFFECT: lower noise in operation of the device.

2 cl, 3 dwg