Cyclopedia of heating, plumbing and sanitation; a complete reference work . slide, outside of which should be placed awire grating, backed by a netting of about |-inch mesh. Vent Flues. In dwelling-houses, vent Hues are often omitted,and the frequent opening of doors and leakage are depended upon tocarry away the im-pure air. A well-designed system ofwarming s h o u 1 dprovide some meansfor discharge ven-tilation, especiallyfor bathrooms andtoilet-rooms, andalso for living roomswhere lights areburned in the even-ing. Fireplaces areusually provided inthe more importantrooms of a well-built hous
Cyclopedia of heating, plumbing and sanitation; a complete reference work . slide, outside of which should be placed awire grating, backed by a netting of about |-inch mesh. Vent Flues. In dwelling-houses, vent Hues are often omitted,and the frequent opening of doors and leakage are depended upon tocarry away the im-pure air. A well-designed system ofwarming s h o u 1 dprovide some meansfor discharge ven-tilation, especiallyfor bathrooms andtoilet-rooms, andalso for living roomswhere lights areburned in the even-ing. Fireplaces areusually provided inthe more importantrooms of a well-built house, andthese are made to serve as vent Hues. In rooms having no fireplaces, special Huesof tin or galvanized iron may be carried up in the partitions inthe same manner as the warm-air flues. These should be gatheredtogether in the attic, and connected with a brick Hue running upbeside the boiler or range chimney. Very fair results may be obtained by simply letting the Hues openinto an unfinished attic, and depending upon leakage through theroof to carry away the foul ^w^w^w^wm^ Fig. 66. Air-Inlet Provided with Cheek-Valves to PreventOutward Plow of Air. 93 84 HEATING Wl> VENTILATION AirValve The sizes of flues m;iv be made the reverse of the warm-air Huesthat is, I square inches area per square Fool of indirecl radiationfor rooms u the first floor, and 2 square inches for those on thesecond. This is because tli« velocity of ll\\ will depend 111>11 theheight of flue, and will iher•? slow ;it best, unless some meansis provided for warming the air in the flue to ;i temperature abovethai of the room with which it connects. The method of carrying up the outboard discharge beside a warmchimney is usually sufficienl in dwelling-houses; but when it is desired to move largerquantities of air, ;i loopof steam pipe should bein inside the Hue Thishould 1><- connected fordrainage and air-ventingshown in Fig. (» vents are carried
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