Heating and ventilating buildings : a manual for heating engineers and architects . ell asby centrifugal force. In general these fans are mounted in acylindrical casing and have a number of vanes or blades whichare arranged with a diminishing pitch from the centre to thecircumference somewhat similar to the blades of a forms are shown, one with plane blades, Fig. 235, onewith curved blades driven by a motor, Fig. 236, and one withhelix-shaped or screw blades, Fig. 237, into which the air isguided by fixed vanes. The fans in this class are useful for moving large volumesof air w
Heating and ventilating buildings : a manual for heating engineers and architects . ell asby centrifugal force. In general these fans are mounted in acylindrical casing and have a number of vanes or blades whichare arranged with a diminishing pitch from the centre to thecircumference somewhat similar to the blades of a forms are shown, one with plane blades, Fig. 235, onewith curved blades driven by a motor, Fig. 236, and one withhelix-shaped or screw blades, Fig. 237, into which the air isguided by fixed vanes. The fans in this class are useful for moving large volumesof air with comparatively low pressures and velocities. Theyare as a rule not adapted for use where there is any greatresistance to be overcome. 157. Volume or Positive Blowers.—This name is appli-cable to that class of blowers which deliver a fixed volume ofair at each revolution and which are positive in their action 342 HEATING AND VENT I LA 1ING BUILDINGS. and prevent the return of compressed air, not by uniform actionof centrifugal force, but by use of valves or by contact of the. Fig. 235.—Propeller Fan withPlane Blades.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1910
