Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances (1918)
Keene, E. S. (Edward Spencer), b. 1864 · New York, McGraw-Hill book company, inc.; · leaf 63
midifyingthe air as it passes through the furnace. In this furnace theoutside casing is of sheet iron, reinforced with wrought-ironflanges. The front, which contains the doors of the fire-box,ash-pit, etc., are of cast iron of ornamented design. As the air to be heated passes through the furnace it… … Fig. 45.—Interior view of a hot-airfurnace. THE HOT-AIR FURNACE 53 it should, therefore, be kept in contact with the heating surfacesas long as possible to insure an economical furnace. In commonpractice the ratio of heating surface to grate surface average 35to 1; that is, for each square foot of…
Heating · Lighting · Plumbing
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