
Electricaire ducted warm-air system 97
The elements, either sheathed-type or 80/20 nickel-chrome wire on
ceramic formers, are inserted into the grooves between the blocks. Electrical
connection is made either to busbars, or interconnected porcelain-insulated
connector blocks fitted inside the heater cabinet (see Fig. 6.22). Various
loadings of elements are available for each size of heater.
Air is drawn into and expelled from the heater by a centrifugal fan,
mounted within or on top of the heater cabinet. The fan is often driven by a
separate induction motor via a belt and adjustable pulley. The heater output
is determined by the fan speed