Cyclopedia of heating, plumbing and sanitation; a complete reference work . h or a 10 by 20-inch, etc., the dimensions of the latticed openingare meant, and not the outside dimensions of the whole register. Thefree opening should have the same area as the flue with which it con-nects. In designing new work, one should provide himself with atrade catalogue, and use only standard sizes, as special patterns andsizes are costly. Fig. 74 shows the method of placing gossamercheck-valves back of the vent register faces to prevent down drafts,the same as described for fresh-air inlets. 98 HEATING AND
Cyclopedia of heating, plumbing and sanitation; a complete reference work . h or a 10 by 20-inch, etc., the dimensions of the latticed openingare meant, and not the outside dimensions of the whole register. Thefree opening should have the same area as the flue with which it con-nects. In designing new work, one should provide himself with atrade catalogue, and use only standard sizes, as special patterns andsizes are costly. Fig. 74 shows the method of placing gossamercheck-valves back of the vent register faces to prevent down drafts,the same as described for fresh-air inlets. 98 HEATING AND VENTILATION 89 Inlet registers in dwelling-house and similar work are placedeither in the floor or in the baseboard; sometimes they are locatedunder the windows, just above the baseboard. The object in viewis to place them wdiere the currents of air entering the room will notbe objectionable to persons sitting near windows. A long, narrowfloor-register placed close to the wall in front of a window, sendsup a shallow current of warm air, which is not especially noticeable. GOSSAMERCHECKS WIRENE TTING Fig. 74. Method of Placing Gossamer Check-Valves back of Vent Register Faceto Prevent Down Drafts. to one sitting near it. Inlet registers are preferably placed nearoutside walls, especially in large rooms. Vent registers should beplaced in inside walls, near the floor. Pipe Connections. The two-pipe system with dry or sealedreturns is used in indirect heating. The conditions to be met arepractically the same as in direct heating, the only difference beingthat the radiators are at the basement ceiling instead of on the floorsabove. The exact method of making the pipe connections willdepend somewhat upon existing conditions; but the general methodshown in Fig. 75 may be used as a guide, with modifications to suit 99 HEATING AND VENTILATION anv special case. The ends of all supply mains should be dripped,and the horizontal returns should !><• sealed it possible. Pipe Sizes. Th
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