Handbook for heating and ventilating engineers . FURNACE HEATING 73 ry the warm air from the room back to the furnace to bereheated for use again wiithin the building. In many casestin or galvanized iron is used for the material for therecirculating pipe. Where this enters the furnace itshould be planned with sufficient turn so that theair would be projected through the furnace, thusplacing a hindrance to the fresh cold air from followingback through this pipe to the rooms. The exact locationof the same will depend, of course, on the location of theregister instaiaed for this purpose. The cons
Handbook for heating and ventilating engineers . FURNACE HEATING 73 ry the warm air from the room back to the furnace to bereheated for use again wiithin the building. In many casestin or galvanized iron is used for the material for therecirculating pipe. Where this enters the furnace itshould be planned with sufficient turn so that theair would be projected through the furnace, thusplacing a hindrance to the fresh cold air from followingback through this pipe to the rooms. The exact locationof the same will depend, of course, on the location of theregister instaiaed for this purpose. The construction of theduct may agree with the similar construction of the freshair duct. 54. Leader Pipes:—All leader pipes should be roundand free from unnecessary turns. They should be made. Fig. 23. 74 HEATING AND VENTILATION from heavy galvanized iron or tin and should be laid to anupward pitch of not less than one inch per foot of length,and more if it can possibly be given. The connections withthe furnace should be straight, but if a turn is necessary,provide long radius elbows. All connections to risers orstacks should be made through long radius elbows. Rect-angular shaped l>oots having attached collars are sometimesused, but these are not so satisfactory because of the im-pingement of the air against the flat side of the stack; alsobecause of tlie danger of the leader entering too far intothe stack and thus sliutting off the draft. Leaders sliouldconnect to the first floor registers by long radius el-bows. Leader pipes should have as few joints as possibleand these should be made firm and air tight. Fig. 23 showsdifferent methods of connecting between leaders and stacks,also between leaders and registers. The outside of all leader pipes should be covered toavoid
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectventila, bookyear1913
