Patent ID: 9261108
Filing Date: 2016-02-16
CPC Classification: F04D

Claim Text:
1. An air handling unit, comprising: an impeller comprising an impeller axis; a first blade support; a second blade support; a third blade support; a plurality of first blades extending between the first blade support and the second blade support; and a plurality of second blades extending between the second blade support and the third blade support; wherein an angular location of attachment of the first blades to the first blade support is angularly offset from an angular location of attachment of the first blades to the second blade support in a first angular direction, wherein an angular location of attachment of the second blades to the third blade support is angularly offset from an angular location of attachment of the second blades to the second blade support in the first angular direction, and wherein the second blade support is configured to allow airflow longitudinally through an interior space of the impeller.