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The main advantage of forced draft over natural draft is that
Which furnace employs natural draft?
The capacity of induced draft fan compared to forced draft fan in a boiler is
The balanced draft furnace is one using
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.