Mechanical Contracting & Plumbing January-December 1908 . uldalways be provided with dampers In thethroat so that an excessive amount ofheated air will not be removed from theroom when the fire-place is not in opera-tion. As noted, the rooms of a house orbuilding will vary in size, shape, anddimensions, and the amount of exposedwall surface, and this will greatly varythe amount of heating surface that willbe needed. Taking the case of a roomcited that is 20x20 feet, with a 10-footceiling, having 4,000 cubic feet of con-tents, situated at the corner, we haveseen that the equivalent glass surfac
Mechanical Contracting & Plumbing January-December 1908 . uldalways be provided with dampers In thethroat so that an excessive amount ofheated air will not be removed from theroom when the fire-place is not in opera-tion. As noted, the rooms of a house orbuilding will vary in size, shape, anddimensions, and the amount of exposedwall surface, and this will greatly varythe amount of heating surface that willbe needed. Taking the case of a roomcited that is 20x20 feet, with a 10-footceiling, having 4,000 cubic feet of con-tents, situated at the corner, we haveseen that the equivalent glass surface() of this room will be equal to320 square feet, and that 128 squarefeet of hot water radiating surface willbe required to maintain 70 degreesFahrenheit in the room when the tem-perature of the outside air stands atzero. Let this room of 4,000 cubic feet con-tents be one that is exposed on only oneside and perfectly square, then we wouldhave a room which would measure 20x20x10 feet. The room has one side ex-posed to the north or west. It is to be. Chart VI.—Showing amount of hot water radiation required for inside temp., fin degrees Pahr.; outside, zero ; water 180 degrees. are windows. As has been previouslystated in calculating the radiation for<i room, the loss due to the leakage ofair around the windows and doors is anelement which often does not receive dueconsideration, and is the one inrtr-tprmin 8 heated to 70 degrees Fahrenheit whenthe temperature outside stands at zero,with the water at 180 degrees Twentypel cent , or one-fifth of the exposureis glass. The exposure in this casewould be 30vlO feet, nr 300 square feet, January 22, 1908. PLUMBER AND STEAMFITTER of which one-fifth or 40 square feet, isglass, having 160 square feet of wallsurface. Dividing the wall surface byfour gives us 80 square feet of equivalentglass surface. Dividing 4,000 by 25(allowing for two changes of air perhour) gives 160 square feet of equival-ent glass surface. Divid
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