. Ventilation for dwellings, rural schools and stables. on three sides with a metal shield, open towardthe door, to cut off direct radiation from the children. Thesmoke flue should rise straight out throufrh the roof, and itshould be surrounded by the ventilating flue as representedin Fig. 48, drawing out the fouled air at the floor level andfrom behind the screen at A. The fresh air should be in-troduced throucrh the ceilinpr risinc: through the walls fromlow down outside, Fig. 47, discharging largely in the frontof the room and over the heater where it may mincrle di-rectly with the warmest
. Ventilation for dwellings, rural schools and stables. on three sides with a metal shield, open towardthe door, to cut off direct radiation from the children. Thesmoke flue should rise straight out throufrh the roof, and itshould be surrounded by the ventilating flue as representedin Fig. 48, drawing out the fouled air at the floor level andfrom behind the screen at A. The fresh air should be in-troduced throucrh the ceilinpr risinc: through the walls fromlow down outside, Fig. 47, discharging largely in the frontof the room and over the heater where it may mincrle di-rectly with the warmest air; or it may be taken directlydown through the roof in the manner shown at BB wherethe duct is provided with a revolving cowl at the top, toutilize fully the ^\^nd pressure, and with an air trap at thelower end to prevent the escape of warm air. Tn still an- 106 Ventilation. other way the air may be let in beneath the floor and directlyup under the stove and inside the jacket. The advantage ofthe method of taking fresh air represented in Fig. 48 is. Fig. 48.—Veutiiiition of school room which must contain the heater. that when there is little or no fire in the heater to force adraft, the combined effect of wind pressure and wind suc-tion may be utilized. A damper in the ventilating flue atC permits the amount of air moving to be controlled at anytime. Ventilation of Stables. 107 Ventilation of Dairy Stables. In the details of stable ventilation there must be almostendless variation to meet individual conditions. Notwith-standing this, the principles governing construction are fewand have already been stated in general terms. Because themotive power usually available in stable ventilation is bothsmall and variable in intensity it is of the highest impor-tance that strict attention be given to all essential details ofconstruction necessary to adequate efficiency. The one detail of paramount importance in every systemof stable ventilation is the outtake flue. It is, in function
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