Blower unit for clean room

Claim 1

A blower unit for clean rooms, said blower unit comprising: a housing having a bottom, a cover, and first and second sidewalls; a filter connected to said bottom; at least one blower mounted in said housing; said at least one blower having two airflow channels; said two airflow channels extending within said housing in a vertical direction between two opposite ones of said first sidewalls, wherein in said airflow channels air flows from said blower to said filter in a vertical direction from said cover to said bottom; a soundproofing material connected to at least one side of said airflow channels; each one of said airflow channels limited by at least one vertically upwardly extending wall with a free upper end spaced at a distance to said cover and a lower end spaced at a distance from said bottom, wherein between said cover and said free upper end a flow opening is defined; and said at least one vertically upwardly extending walls connected to said two first opposite sidewalls; a horizontal bottom plate connecting said lower ends and connected to said two first opposite sidewalls; wherein said flow opening has a height selected such that a flow velocity of the clean air flowing through said flow opening is less or at most identical to a flow velocity of the clean air flowing within said airflow channel.