Combination of two counterrotating centrifugal fans

摘要

A fan apparatus comprising a first fan and a second fan, both of which are centrifugal fans, impellers of the first fan and the second fan are located adjacent one another and are adapted to rotate in opposite directions, a first outlet opening (ot1) provided on a housing of the first fan is located relative to a second outlet opening (ot2) provided on a housing of the second fan such that a flow pattern of the first fan overlaps at least partially with a flow pattern of the second fan when viewed from a direction of a rotation axis of an impeller of the first fan.