Catalog no201: Buffalo Niagara conoidal fans . , which with other types of fans is necessarily lost by shockand eddy currents at or immediately beyond the fan outlet, This peculiar NIAGA R A CONOIDAL (TYP E N) F A N S form of housing produces velocities which are nearly uniform across the entireface of the outiet. Many tests were made on various sizes of Niagara Conoidal fans with dif-ferent designs of housings and it was found that the greatest possible conver-sion of velocity head at tip of blades into static pressure at fan outiet wasobtained by making the inner edge of the outiet approxima
Catalog no201: Buffalo Niagara conoidal fans . , which with other types of fans is necessarily lost by shockand eddy currents at or immediately beyond the fan outlet, This peculiar NIAGA R A CONOIDAL (TYP E N) F A N S form of housing produces velocities which are nearly uniform across the entireface of the outiet. Many tests were made on various sizes of Niagara Conoidal fans with dif-ferent designs of housings and it was found that the greatest possible conver-sion of velocity head at tip of blades into static pressure at fan outiet wasobtained by making the inner edge of the outiet approximately tangent to theperiphery of the wheel and the height of the outiet approximately equal to thewheel diameter. Our Standard guarantee is that static pressure of air issu-ing from any part of the fan outiet as measured by a pitot tube is not morethan 15% above or below the average static pressure. The Niagara Conoidal fan is especially adapted to handle a large volume ofair at a comparatively low pressure when running at a moderate speed. As. Wheel Blades will be seen from the foUowing description this is the only fan which is de-signed and constructed with a thorough understanding of all of the factorscontributing to the high efficiency of this class of fans. In multiblade fans a high suction is produced at the fan inlet and thistends to draw the air in at almost a right angle to the back or drive the air strikes the back plate it is deflected toward the blades and out-iet at almost 90° and naturally this sudden change of direction causes a loss ofvelocity and power. Also a large part of the air will be taken up by the rearpart of the blade, the front part will not handle its proper proportion and anuneven pressure will be produced at the fan outiet, resulting in eddy currentswhich materially reduce the fan efficiency. The Niagara Conoidal Type Nfan is so designed as to entirely overcome these difficulties. The blades are narrow at the front and increase in width t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectventila, bookyear1915
