. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students . Fig. 140. Multivane Fig. 141. Bisk-fan, Direct Connected. systems where the flow of air through vent flues is apt to be slug-gish in mild weather. 194 HEATING AND VENTILATING PLANTS Proportions of Centrifugal Fans. The general form of a fan of the paddle wheel type is shownin Fig. , which represents a single spider wheel with curvedblades. Those over 4 feet in diameter usually have two spiders,while fans of large size are often provided with three or number of
. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students . Fig. 140. Multivane Fig. 141. Bisk-fan, Direct Connected. systems where the flow of air through vent flues is apt to be slug-gish in mild weather. 194 HEATING AND VENTILATING PLANTS Proportions of Centrifugal Fans. The general form of a fan of the paddle wheel type is shownin Fig. , which represents a single spider wheel with curvedblades. Those over 4 feet in diameter usually have two spiders,while fans of large size are often provided with three or number of floats or bladies commonly varies from 6 to 12,depending upon the diameter of the fan. They are made bothcurved and straight; the former, it is claimed, run more quietly,but if curved too much, will not work so well against a highpressure. Fig. 143 represents a fan wheel in diagram and showsthe principal dimensions to be considered. ?-^ f I I W Fig. 142. Diagram of Fan Wheel, Showing Principal Dimensions. Average Dimensions.—The following proportions are averagestaken from fans of different sizes as made by several manufac-turers f
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectventilation, bookyear
