Cyclopedia of heating, plumbing and sanitation; a complete reference work . Pig. 11. Concealed Radiator withRegi- r I 235 12 STEAM AND HOT WATKR FITTING is to place them below window-sills, with a grating or register face infront of and above them, as shown in Fig. 11. By this arrangement,the radiant heal is to ;i great extent cut off. The gratings must haveample area to permit the free circulation of air, and should have not. Fig. 13. Radiator for Use without Gratings. less than 2 or 2\ square inches of free area to each square foot ofradiating surface, for inlets and outlets respectively. It
Cyclopedia of heating, plumbing and sanitation; a complete reference work . Pig. 11. Concealed Radiator withRegi- r I 235 12 STEAM AND HOT WATKR FITTING is to place them below window-sills, with a grating or register face infront of and above them, as shown in Fig. 11. By this arrangement,the radiant heal is to ;i great extent cut off. The gratings must haveample area to permit the free circulation of air, and should have not. Fig. 13. Radiator for Use without Gratings. less than 2 or 2\ square inches of free area to each square foot ofradiating surface, for inlets and outlets respectively. It is advisableto increase these allowances slightly when possible. The same rule applies to radiators placed below seats. A radia- ^ H\ c=* I Wall «^V Floor . 1 Wall floor ?-A^K, .-, - vVvn5 Fig. 13. Hook Plates. Fig. 14. Expansion Plates, tor designed specially for this purpose, for use without gratings, iashown in Fig. 12. Wall Coils. An ordinary wall coil or manifold coil, made upgenerally of IJ-inch pipe, with branch tees or manifolds, is illustrated 236 STEAM AND HOT WATER FITTING 13 in Fig. 39, Part I (Heating and Ventilation). The long runs of suchcoils rest on hook plates (Fig. 13); the short pipes near the corner, onexpansion plates (Fig. 14), on which the pipes are free to move whenthe long pipes expand. Such coils are very effective when placedbelow the windows of a factory, in which class of buildings the
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