Patent ID: 8657898

Claim:
An air filtration device generating air spin for use for pre filtering air entering an unloading conduit for a storage device for storing granular material comprising a housing, said housing incorporating an air inlet, and an air outlet, said housing having a longitudinal filter element arranged therein, the filter element having a length, wherein air passing into the housing through the air inlet passes through the filter and after filtration passes through the air outlet into the unloading conduit, a baffle being located within the air inlet to provide for lessening of any sound generated during a pumping of the air into the air inlet to pass through the filter, an entrance door connecting with an end of the housing, which when opened, allows for installation or removal of the filter element, and said air inlet being contoured to provide for a spin flow of the air entering into the housing to induce for its circulation around the filter along the length of the filter to attain efficient filtration of the air before the air is applied to convey the granular material from the storage device.