Cyclopedia of heating, plumbing and sanitation; a complete reference work . HOT WATER HEATER AND CONNECTIONS. HEATING ANT) VENTILATN >N 81 It is often desirable to warm a room at times when ventilationis not necessary, as in the case of living rooms during the night, orfor quick warming in the morning. A register and damper for airrotation should be provided : i this case. Fig. 65 an arra ment for this puriose. When the damper is in the position shown;air will be taken from the room above and be warmed over and over;but, by raising the damper, the supply will be taken from
Cyclopedia of heating, plumbing and sanitation; a complete reference work . HOT WATER HEATER AND CONNECTIONS. HEATING ANT) VENTILATN >N 81 It is often desirable to warm a room at times when ventilationis not necessary, as in the case of living rooms during the night, orfor quick warming in the morning. A register and damper for airrotation should be provided : i this case. Fig. 65 an arra ment for this puriose. When the damper is in the position shown;air will be taken from the room above and be warmed over and over;but, by raising the damper, the supply will be taken from care should be taken to make all mixing dampers tight againstair-leakage, else their advantages will be lost. They should workeasily and close tightly against flange- covered with felt. They maybe operated from the rooms above by means of chains passing over. Fig. 65. Arrangement for Quick Heating without Ventilation. Damper Shuts ofl FreshAii-. and Air of Room Heated by Rotating Forth and Back thrRegister and Heater. guide-pulleys; special attachments should lie provided for holdingin any desired position. \Varm=Air Flues. The required size of the warm-air flue betweenthe heater and the register, depends first upon the difference in tem-perature between the air in the flue and that of the room, and second,upon the height of the flue. In dwelling-houses, where the con-ditions are practically constant, it i- customary to allow 2 squareinches area for each square foot of radiation when the room i- on thefirst floor, and H square inches for the second and third floors. Inthe case of hospitals, where a greater volume of air i- required, thesefigures may be increased to :; square inches for the first floor wards,and _ -i|uare inches for those on the upper floors. In schoolhouse work, it is more usual to calculate the siflue from an assumed velo
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