A manual of hygiene and sanitation . nd necessitating toorapid and too intense combustion of fuel. Tliere shouldbe a considerable expanse of surface, never too highlyheated, so that large volumes of air will be moderatelywarmed rather than small quantities overheated and burned. Air too highly heated is very dry and offen-sive to the senses; also, by taking excessive moisture fromthe body through the skin and mucous membranes and byexciting glandular activity, it increases the liability tofrequent colds and congestions. Moreover, a largequantity of air moderately warmed will perforce be car-ri
A manual of hygiene and sanitation . nd necessitating toorapid and too intense combustion of fuel. Tliere shouldbe a considerable expanse of surface, never too highlyheated, so that large volumes of air will be moderatelywarmed rather than small quantities overheated and burned. Air too highly heated is very dry and offen-sive to the senses; also, by taking excessive moisture fromthe body through the skin and mucous membranes and byexciting glandular activity, it increases the liability tofrequent colds and congestions. Moreover, a largequantity of air moderately warmed will perforce be car-ried to all the rooms of the house, warming them equablyand driving before it the air already there : whereas amuch smaller volume, excessively heated by the same oreven a greater amount of fuel, will make its way along 134 VENTILATION AND HEATING. the channels of least resistance to a few favorably locatedrooms, overheating them while the rest of the house is un-warmed, and any satisfactory natural ventilation is pre-vented. Fig. Hot-air furnace, showing cold-air inlet and hot-air flues. Only one of thelateral branches of the main inlet {A} above is shown. All joints in the furnace must be as nearly gas-tight aspossible to prevent the combustion-products passing fromthe fire-box or smoke-flues into the air-chambers andthence into the rooms above. PRACTICAL POINTS ABOUT FURNACES. 135 The furnace should be located near the cold side of thehouse—that is, the side on which the prevailing cold windsimpinge—for it is said to be as difficult to drive the airten feet against the wind as forty or fifty feet with may also be well, if the basement ceiling is low, to placethe ash-pit below the level of the basement floor, in orderto give sufficient slope to the air-ducts; but in everycase the space beneath the furnace should be floored andlined with cement or asphalt to prevent the drawing in ofsoil-air. The air-supply should not be taken from the cellar,even though the latte
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecthygiene, bookyear1903
