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In recuperative air preheaters, the heat is transferred
__________ furnace is not an electric furnace.
Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by
Which furnace employs an I.D. fan for the removal of flue gases from the furnace?
Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.
Operation of blast furnace stove is based on the principles of a __________ furnace.