Heating and ventilating buildings : a manual for heating engineers and architects . Fig. 97.—Sectional Radiator. Fig. 99.—Crescent Flue Radiator. * With permission from Heating and Ventilation. 142 HEATING AND VENTILATING BUILDINGS. The sectional radiators are in many cases built in such amanner as to form flues for the passage of air from the bottomto the top of the radiator for the purpose of increasing the air-heating capacity. Such radiators are termed fltie radiators (Fig- 99)-. Fig. ioo.—Whittier Extended Surface Radiator. Radiators are sometimes built with projecting fins or orna-ments
Heating and ventilating buildings : a manual for heating engineers and architects . Fig. 97.—Sectional Radiator. Fig. 99.—Crescent Flue Radiator. * With permission from Heating and Ventilation. 142 HEATING AND VENTILATING BUILDINGS. The sectional radiators are in many cases built in such amanner as to form flues for the passage of air from the bottomto the top of the radiator for the purpose of increasing the air-heating capacity. Such radiators are termed fltie radiators (Fig- 99)-. Fig. ioo.—Whittier Extended Surface Radiator. Radiators are sometimes built with projecting fins or orna-ments of cast iron for the purpose of greatly extending thesurface in contact with the air. Such a radiator is termed anextended surface radiator, and is now little used for direct heat-ing (Fig. ioo). The radiators in principal use are constructed as described,but radiators have been built by many other methods and inmany other shapes. They have been constructed of one solidcasting, and by uniting sections of various forms by bolts andpacked joints. 67. Hot-water Radiators.—Hot-water radiators differessentially from the steam-radiators in having a horizontalpassage at the top as well as at the bottom. This constructionis necessary in order to draw off the air which gathers at the topof each loop or section. Aside from this the construction maybe the same in every particular as that for steam-radiators; in * RADIATORS AND 111:A TING SURFACES. 143 general the hot-water radiator
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