. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students. 4 sq. inches INDIRECT STEAM HEATING 121 Cottage Hospitals Vent flue area per square foot of indirect Story radiating surface 1st 2 2nd 3 3rd 4 Velocity of Air in Flues. In order to secure a flow of air through a vent flue there mustbe an acting force to produce Fig. 82. Aspirating Coil for Small Flue. In gravity heating this is due to the higher temperature withinthe flue, as already described for the warm-air pipes. This temperature difference,
. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students. 4 sq. inches INDIRECT STEAM HEATING 121 Cottage Hospitals Vent flue area per square foot of indirect Story radiating surface 1st 2 2nd 3 3rd 4 Velocity of Air in Flues. In order to secure a flow of air through a vent flue there mustbe an acting force to produce Fig. 82. Aspirating Coil for Small Flue. In gravity heating this is due to the higher temperature withinthe flue, as already described for the warm-air pipes. This temperature difference, and the resulting velocity, isusually less than in the corresponding supply flue, and is offsetpartly by the smaller quantity of air passing through the vent,due to leakage, and partly by increasing the size of flue. In dwelling houses it is customary to make the correspondingsupply and vent flues about the same size, while in schools andhalls the vents are made somewhat larger, being based uponaverage velocities about as follows: 1st story 320 feet per 260 3d 200 In estimating the volume of air passing through a vent flueit is customary to assume that about three-fourths of the air 122 HEATING AND VENTILATING PLANTS entering the room through the supply register will pass out byway of the vent, the remainder being disposed of by leakage. Aspirating Coils.—While a flue beside a warm chimne
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