Cyclopedia of heating, plumbing and sanitation; a complete reference work . uld be covered with galvanized wire nettingwith a mesh of at leas- three-eighths of an inch. The frame to whichit is attached should not , ii ? ,i * • IM] ^ rOR RETURNING be smaller than the in- m f air from above side dimensions of the cold-air box. A door to admit air from the cellar to the cold-air box is generally provided. As a rule, air should be taken from this source, only when the house is temporarily unoccupied or during high winds. Return Duct. Insome cases ii is desirableto return air to the fur-nace from t
Cyclopedia of heating, plumbing and sanitation; a complete reference work . uld be covered with galvanized wire nettingwith a mesh of at leas- three-eighths of an inch. The frame to whichit is attached should not , ii ? ,i * • IM] ^ rOR RETURNING be smaller than the in- m f air from above side dimensions of the cold-air box. A door to admit air from the cellar to the cold-air box is generally provided. As a rule, air should be taken from this source, only when the house is temporarily unoccupied or during high winds. Return Duct. Insome cases ii is desirableto return air to the fur-nace from the roomsabove, to be reheated. I )ucts for this purpose are common in placeswhere the winter temperature is frequently below zero. Returnducts when used, should be in addition to the regular cold-air box. 9 shows a common method of making the connection betweenthe two. By proper adjustment of the swinging damper, the air canbe taken eilher from our of doors or through the register from theroom above. The return register is often placed in the hallway of COLD AIRINLET. Fig 9. Common Method f Connecting Return Duct to(old-Air Box. 39 So HEATING AND \T\TII.\TI< )\ a house,so thai it will take the cold air which rushes in when thedoor is opened and also that which may leak in around it whileclosed. Check-valves or Haps of light gossamer or woolen clothshould be placed between the cold-air box and the registers to pre-vent hack-drafts during winds. The return duct should nt be \\m<\ too freely at the expense ofoutdoor air, and its use is not recommended except during the nightwhen air is admitted to the sleeping rooms through open windows. Warm-Air Pipes. The required size of the warm-air pipe toany given room, depends on the heat loss from the room and on thevolume of warm air required t offset this lo^s. Each cubic fool ofair warmed from zero to 120 degrees brings into a room B. T. I .We have already seen that in zero weather, with the air entering the registers at 120
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