Heating And Ventilation a Working Manual of Approved Practice in the Heating An
Heating And Ventilation a Working Manual of Approved Practice in the Heating An
Chicago American School of Correspondence
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Wall registers should be provided with pull-cords for opening and closing from the floor? these are shown in Fig. 72. The plain lattice pattern shown in Fig. 73 is the best for schoolhouse- work, as it has a comparatively free opening for air-flow and is pleasing and sim- p 1 e in design. More elaborate patterns are used for fine dwelling- house work. Registers with shut-off valves are used for air- inlets, while the plain register faces without the valves are placed in the vent open- ings. The... vent flues are usually gathered together in the attic, and a single damper may be used to shut off the whole number at once, Flat or round wire gratings of open pattern are often used in place of Fig. 71. Cast-Iron Border for a Floor Register. 88 HEATING AND VENTILATION register faces. The grill or solid part of a register face usually takes up about J of the area; hence in computing the size, we must allow for this by multiplying the required "net area" by 1. 5, to obtain the "total" or "over-all" area.
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