Patent ID: 7001140
Filing Date: 2006-02-21
Classification: F04D

Abstract:
1. An air handling method comprising the steps of: accepting air into a centrifugal fan having a centrifugal fan impeller element; rotationally impelling said air through use of said centrifugal fan impeller element; imparting a centrifugal force to said air; discharging said impelled air into a diffuser element; transforming tangential velocity pressure of said discharged, impelled air to static pressure without using vanes and by decreasing tangential velocity of said discharged, impelled air; increasing static pressure of said discharged, impelled air as a result of said step of decreasing tangential velocity of said discharged, impelled air; outputting said discharged, impelled air to a flow turning element that outputs to a plenum; and controlling radial velocity of said discharged, impelled air so as to avoid recirculation back into said flow turning element of said discharged, impelled air that is output to said plenum, wherein said step of transforming tangential velocity pressure comprises the step of radially extending an interface through which said discharged, impelled air is output to said plenum, and wherein said step of controlling radial velocity of discharged, impelled air comprises the step of axially converging said discharged, impelled air.