The Ventilation of Dwelling Houses and the Utilization of Waste Heat from Open Fire-Places; Including Chapters on London Smoke & Fog, Modern Fire-Places, Etc (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1881 Excerpt: ...at the upper part of a room. It is usual for them to contend that the warm vitiated air from the lungs ascends and contaminates the fresh air. Practice has, nevertheless, almost invariably followed a course in discordance with such theory, and not without good reason. When cold air is introduced below, the sensation to the feet is very disagreeable, but, when carefully introduced above, it increases in temperature by contact with warmer air, and mixes with the general body of air in the room without occasioning the slightest inconvenience. These remarks, it must be borne in mind, refer only to r the supply of air for domestic and other ordinary purposes, and do not apply to public rooms or buildings where different conditions demand different treatment. Whenever there are arrangements for warming the air before it enters the room, the air is of course admitted near to or at the floor. Dr. Reid, it has been seen, had a perforated floor, an open carpet, and his warming apparatus below. For domestic purposes, it is common to use hot-water pipes fixed behind the skirting-board, with gratings to admit air from an external source into the main air channel containing the pipes, and thence through other gratings, or slips of perforated zinc, into the room. Others have used a metal grate, as figs. 68 and 69, with a warm air chamber behind, which has been placed by means of an air channel in communication with an external wall, and by means of certain apertures on the front surface of the grate, in communication with the room. A certain amount of fresh air enters after becoming warm by contact with the back part of the grate. With respect to the notion that fresh air, when introduced above, is more liable to contamination before it is inhaled than when introduced bel...