Heating and ventilating buildings : a manual for heating engineers and architects . tie 21 42 63 84 IO5 126 168 2IO 420 630 840 Net area ventilating register . 7 33 51 68 85 102 35 170 345 500 670 * This quantity is defined page For pitch of one inch per foot. Use larger pipe for less pilch. Note.—The proportions in the above table agree very well with those givenbv the Excelsior Steel Furnace Co. for the condition of changing the air in eachroom four times per hour, which can be taken as representing the averageamount required to bring in the heat. The grate surface is computed for comb
Heating and ventilating buildings : a manual for heating engineers and architects . tie 21 42 63 84 IO5 126 168 2IO 420 630 840 Net area ventilating register . 7 33 51 68 85 102 35 170 345 500 670 * This quantity is defined page For pitch of one inch per foot. Use larger pipe for less pilch. Note.—The proportions in the above table agree very well with those givenbv the Excelsior Steel Furnace Co. for the condition of changing the air in eachroom four times per hour, which can be taken as representing the averageamount required to bring in the heat. The grate surface is computed for combustion of 3 pounds per square footper hour, with an efficiency of 70 per cent, or a greater amount at less heating surface given in above table is much larger than ordinarily foundin furnaces, but not too large for best results. 142. Air-supply for the Furnace.—The air-supply for thefurnace is usually obtained by the construction of a passage-way or duct of wood, metal, or masonry leading from a pointbeneath the furnace casing or near its bottom to the outside. Fig. 20S.—Hot-air Furnace with Cold-air Box below Cellar Bottom. air, essentially as shown in section Fig. 208. This duct or pipeis usually termed the cold-air box and is often constructed of 318 HEATING AND VENTILATING BUILDINGS. wood. In all cases there should be a screen over the outerend to keep out vegetable matter or vermin, and doors shouldbe arranged so that it can be cleaned periodically. A damperis usually desirable, arranged so that it can be partly or entirelyopened to regulate the admission of the cold air. The cold-air box should be made perfectly tight and in a workmanlikemanner, so that air cannot escape into or be drawn from thecellar or basement. This should join onto the furnace casingat as Iowa point as the character of the cellar bottom will per-mit. In some instances it is desirable to erect two cold-airboxes, opening to the air on opposite sides of the house, sothat the supply
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