Patent ID: 9618010
Date: 2017-04-11
CPC Classifications: F04D

Claim:
1. A fan system comprising: an orifice having an inner surface, the inner surface comprising: a fan disposed at least partially in the fan orifice, the fan comprising: a minimum clearance comprising a first radial distance between a portion of the minimum radius section of the inner surface of the orifice and the top tip of the fan, wherein the minimum clearance is approximately 0.0075 times the fan diameter to approximately 0.0125 times the fan diameter; and a maximum clearance comprising a second radial distance between a portion of the converging section of the inner surface of the orifice and the bottom tip of the fan, wherein the maximum clearance is approximately 0.04 times the fan diameter to approximately 0.05 times the fan diameter; wherein an axial distance between the top tip of the fan and a bottom of the orifice is approximately 0.85 times the fan height to approximately 0.95 times a fan height.