Section 49(5) in Faridabad Complex Administration Building Rules, 1989
(5)The jamb of a fire place opening shall be at least 20 centimetres in width and the back of the chimney opening in a party wall are not back to back. The required 20 centimetres of solid wall at back of the fire place shall be carried upto the floor of the room above.In an external or internal wall the back of the opening and all sides of the flues shall be at least 10 centimetres thick.
