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During the period of cooling and hardening from its molten state, BF slag can be cooled in several ways to form any of several types of BF slag products. Blast Furnace: Combustion material and ore are supplied from the top while an air flow is supplied from the bottom of the chamber.
Furnace Plenum. A plenum is a compartment, air space or chamber that is filled with air that is then distributed elsewhere. A furnace plenum then, is such an air chamber that gets filled directly (and quickly) by a large blower that is above, below or adjacent to it. Air ducts connected to a furnace or heater plenum carry this air to various registers around a house or building.