(A) Through a metallic wall
(B) By direct contact of hot flue gas with air
(C) By heating an intermediate material (like chequor bricks) and then heating the air from this hot material
(D) None of these
(A) Through a metallic wall
(B) By direct contact of hot flue gas with air
(C) By heating an intermediate material (like chequor bricks) and then heating the air from this hot material
(D) None of these
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