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or air handler to different rooms or hallways. a separate system of return ductwork brings air back to the furnace or air handler to be reconditioned. in theory, a ductwork system sounds fairly basic. but there are several problems that shouldn't be allowed to persist because of their adverse effects...
containing % lead), matte (sulfides containing % lead), and speiss (arsenides of iron and copper). these wastes contain concentrations of copper, zinc, cadmium, and bismuth that can be recovered economically, as can their content of unreduced lead. metallic lead that results from the roasting and blast furnace...