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Ventilation In American Dwellings

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Original Publisher: Wiley

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Product Details

  • ISBN-13: 9781150791635
  • Publisher: General Books LLC
  • Publication date: 12/24/2009
  • Pages: 46
  • Product dimensions: 7.44 (w) x 9.69 (h) x 0.10 (d)

Read an Excerpt

CHAPTER VIIL. SUPPLY OF AIR AT AND IMMEDIATELY ABOVE THE FIRE-PLACE. An ordinary fire-place is the subject of much complaint by an invalid, who is exceedingly sensitive to any cold currents of air. On examination it is found that the chimney flue is many times larger than is required for the grate. Contracting it, accordingly, at the top, the evil is in a great measure removed. A further reduction in the current may be produced by supplying the room with air as shown by Figs. 28, 29, and 30. These indicate a supply of fresh air introduced behind the' grate, where it is warmed previous to gaining access to the apartment, and its distribution at 5, c, d, and e. The larger the proportion of fresh air admitted near the fire, the less is there to traverse the room before it is warmed, and produce a disagreeable draught. In small rooms or offices constructed subsequent to the erection of the building to which they are attached, air is often advantageously introduced in this manner at the chimney breast alone, Fig. 31, or at the ceiling, the whole surface being made .porous by gauze steeped in a solution to render it less inflammable if perforated zinc be not used. Many buildings are provided with an excellent heating apparatus, but when this is not combined with such sys- SUPPLY OF ATR AT AND ABOVE THE FIRE -PLACE. 41 tematic ventilation as the peculiarities of the circumstances require, it often acts at a great disadvantage, being ill supplied with fresh air, and unable, consequently, to give the equal and genial temperature it might otherwise produce. It cannot be too carefully remembered that ventilation has always a cooling effect, except when the temperature of the air entering theapartment to be ventilated exceeds that of the living frame. The greater t...
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