Cyclopedia of heating, plumbing and sanitation; a complete reference work . A schoolroom on the third floor has o(J pupils, who areto be furnished with 30 cubic feet of air per minute each. What willbe the required areas in square feet of the supply and vent flues? Axs. Supply, +. Vent, +. 2. What size of heater will be required in a vent flue 40 feethigh and with an area of 5 square feet, to enable it to discharge 1,530cubic feet per minute, when the outside temperature is 60°? (Assumean efficiency of 400 B. T. U. for the heater.) Ans. square feet. 96 HEATING AND VENTILATION 87 R
Cyclopedia of heating, plumbing and sanitation; a complete reference work . A schoolroom on the third floor has o(J pupils, who areto be furnished with 30 cubic feet of air per minute each. What willbe the required areas in square feet of the supply and vent flues? Axs. Supply, +. Vent, +. 2. What size of heater will be required in a vent flue 40 feethigh and with an area of 5 square feet, to enable it to discharge 1,530cubic feet per minute, when the outside temperature is 60°? (Assumean efficiency of 400 B. T. U. for the heater.) Ans. square feet. 96 HEATING AND VENTILATION 87 Registers. Registers are made of cast iron and bronze, in a great variety of sizes and patterns. The almost universal finish forcast-iron registers is black Japan; but they arc also finished incolors and electroplated with copper and nickel. Fig. 70 ? & tL shows a section through afloor register, in which A rep-resents the valves, which maybe turned in a vertical or hori-zontal position, thus openingor closing the register; B is theiron border; C, the register box. Fig. 70. Section through a Floor Regis! er. of tin or galvanized iron; and D, the warm-air pipe. Floor registersare usually set in cast-iron borders, one of which is shown in Fio\ 71;while wall registers may be screwed directly to wooden borders orframes to correspond with the finish of the room. Wall registersshould be provided with pull-cords for opening and closing from thefloor: these are shown in Fig. 72. The plain lattice pattern shown inFig. 73 is the best for schoolhouse work, as it has a comparatively free opening forair-flow and ispleasingand sim-ple in elaboratepatterns are usedfor fine dwelling-house withshut-off valvesan- used for air-inlets, while theplain registerfaces without the valves are placed in the vent open-ings. The vent flues arc usually gathered together in the attic, anda single damper may be used to shut off the whole number at or round wire gratings of
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