It has already been stated that a group of sections connected together is called a stack, and examples of these with their casings are shown in Fig.. 6 and 7 of Part I. The casings are usually made of galvanized iron and are made up in sections by means of small bolts so that they may be taken apart in case it is necessary to make repairs. Large stacks are often enclosed in brick work; the sides consisting of 8-inch walls and the top being covered over with a layer of brick and mortar supported on light wrought iron tee bars. Where a single stack supplies several flues or registers the connections between these and the warm-air chamber are made in the same manner as already described for furnace heating. When galvanized iron casings are used the heater is supported by hangers from the floor above. Fig. 6 shows the method of hanging a heater from a wooden floor. If the floor is of fireproof construction the hangers may pass up through the brickwork and the ends be provided with nuts and large washers or plates; or they can be clamped to the iron beams which carry the floor. Where brick casings are used, the heaters are supported upon pieces of pipe or light I-beams built into the walls.

Stacks And Casings 100081

Fig. 4.

Stacks And Casings 100082

Fig. 5.