Handbook for heating and ventilating engineers . ering is usually one or more thicknesses of asbes-tos paper or mineral wool. 55. Stacks or Risers:—The vertical air pipes leading tothe registers are called stacks or risers. They are rect-angular or oblong in section and are usu-ally fitted within the wall. See Fig. size of the studding and the distancesthey are set, center to center, limit theeffective area of the stack. All stacksshould be insulated to protect the wood-work. This is done by making the stacksmall enough to clear the woodwork byat least one-quarter inch and then wrap-pin
Handbook for heating and ventilating engineers . ering is usually one or more thicknesses of asbes-tos paper or mineral wool. 55. Stacks or Risers:—The vertical air pipes leading tothe registers are called stacks or risers. They are rect-angular or oblong in section and are usu-ally fitted within the wall. See Fig. size of the studding and the distancesthey are set, center to center, limit theeffective area of the stack. All stacksshould be insulated to protect the wood-work. This is done by making the stacksmall enough to clear the woodwork byat least one-quarter inch and then wrap-ping it with some non-conducting materialsuch as asbestos paper held in place bywire. Another way, and one which is prob-ably more satisfactory, is to have pat-ented double walled stacks having an airspace between the walls all around. Theoutside wall is usually provided with ventholes which allow the circulation of airbetween the walls, thus protecting anyone part frqjjn becoming overheated. AllFig. 24. stacks sliouli, be made With tight Joints. FURNACE HEATING 75 and should have ears or flaps for fastening to the sacks are made in standard sizes and of variousleng-ths. The sizes ordinarily found in practice are aboutas given in Table 19, Appendix. A stack is sometimes run up in a corner or in somerecess in the wall of a room where its appearance, afterbeing finished in color to compare with that of the room,would not be unsightly. This is necessary in any casewhere the stack is installed after the building is method is desired by some because of its additionalsafety and because more stack area may be obtained thanIs possible when placed within a thin wall. All stacks should be located in partition walls lookingtoward the outside or cold side of the room. This protectsthe air current from excessive loss of heat, as would be thecase in the outside walls. It also provides a more uniforfiadistribution of air. The area of the stack best adapted to an
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectventila, bookyear1913
