Section 49(6) in Faridabad Complex Administration Building Rules, 1989
(6)Every fire place shall have a flue giving a brick opening of not less than 20 centimetres x 20 centimetre or not less than 75 square centimetres if a pipe is used; provided that in case of re-inforced cement concrete construction, the flue shall not be less than 20 centimetres x 10 centimetre.
