Patent ID: 8025477

Claim:
A fan assembly comprising: a. a fan wheel having an axial air inlet delimited by an air inlet cone, an annular air outlet, a back plate, and front plate opposite said back plate; b. a frame within which said fan wheel is supported for rotation about a central axis thereof; c. first air outlet diffusing structure supported by a portion of said frame adjacent said back plate of said fan wheel, said first air outlet diffusing structure comprising a peripheral region; d. a second air outlet diffusing structure supported by a portion of said frame adjacent said front plate of said fan wheel, said second air outlet diffusing structure comprising a peripheral region, air exiting said annular air outlet of said fan wheel passing between said peripheral regions of said diffusing structures, and e. a third air outlet diffusing structure supported by a portion of said frame intermediate said first and second air outlet diffusing structures, a spacing between free edges of peripheral regions of said diffusing structures being less than a spacing between a free edge of said back plate and a free edge of said front plate.