Centrifugal fan to two stages, the imbalance can be adjusted without dismantling.

摘要

A) a centrifugal fan to two stages, the imbalance can be adjusted without dismantling. & br / b) fan characterized in that the shaft (14) exceeds the wheel, in the direction of an opening (22) of the housing, by a part (26, 28) belonging to the shaft and having an annular groove (32) in which an essentially annular element, comprising a balancing mass (42, 44) can be, by widening against the action of an elastic force, which is introduced and fixed. & br / c) the invention relates to the fans.