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State of Tamilnadu - Section

Section 23 in The Chennai City Corporation Building Rules, 1972

23. Chimneys and flues.

(1)All heating and cooking appliances, burning solid, liquid or gas fuel shall be connected to and have their products of combustion removed by a chimney or flue.
(2)The height of chimneys and flues shall be-
(a)not less than sixty centimetres above the ridge of the roof, if they penetrate the same;
(b)not less than one metre above a flat or pitched roof, measured from the high side;
(c)not less than the height of any part of the building coming within a horizontal radius three metres and seventy five centimetres of the chimney; and
(d)not less than sixty centimetres higher than any part of the building coming within a horizontal radius of one and half meters of the chimney.
(3)Chimneys extending over five times their least dimensions above the roof shall be designed to withstand a wind pressure of the locality.
(4)
(a)Every chimney or flue included in the construction of a building shall be built upon solid foundations and with footings similar to the footings of the wall against which such chimney is built and be properly bonded into such wall.
(b)Chimneys or flues shall be constructed in accordance with the following provisions:-
(i)Chimneys or flues may be built on sufficient corbels of brick, stone or other hard and incombustible materials, if the work so corbelled out does not project from the wall more than the thickness of the wall measured immediately below the corbel;
(ii)Where a chimney or flue passes through a room, no change shall be made in the size or shape of the chimney or flue within a distance of fifteen centimetres above or below the roof joints or rafters;
(iii)Every such chimney or flue shall be properly capped with brick, terracota stone, castiron, concrete or other approved incombustible, weather proof material;
(iv)All chimneys or flues which are or become unsafe or dangerous shall be made safe or taken down;
(v)No chimney or flue shall support any load other than its own weight;
(vi)The duct area for the solid and liquid fuels shall be as follows:
Minimum area of the flue or chimney
Type of equipment Lined Unlined
  Round Rectangular  
Small stoves and heaters 180 sq.cm. 200 sq.cm. 410 sq.cm.
Ranges and room heaters 260 sq.cm. 325 sq.cm. 550 sq.cm.
Fire places 1/12 of opening or minimum 28 cm. diametre. 1/10 of opening or minimum 875 sq.cm. ⅛ of opening or minimum 900 sq.cm.
(vii)In the case of fire places, the dimensions of the flue openings for different fire place openings may be generally as follows:-
Fire place opening Flue opening oblong or square brick work Round
Width in centimetres Height in centimetres Length in centimetres Breadth in centimetres Diameter in centimetres
60 60 35 25 28
--- 71 35 25 28
75 71 35 25 28
--- 75 35 25 28
81 7 35 25 28
--- 75 35 25 30
86 75 35 35 30
92 75 35 35 30
102 75 35 35 33
107 75 46 35 33
121 81 46 35 33
137 86 46 46 38
--- 92 46 46 41
152 92 46 47 43
--- 99 57 46 43
183 102 57 46 48
--- 107 57 46 48
(viii)The inside of every chimney or flue shall be properly rendered or pargetted as such chimney or flue is carried up, unless the whole chimney or flue shall be lined with fire brick or fire proof piping of fire clay at least two and a half centimetres thick and unless the spandrel angles shall be filled in solid with brick work or other incombustible material;
(ix)Every chimney or flue intended for use in connection with any furnace or copper, steam boiler or close fire constructed for any purpose of trade, business or manufacture or which may be intended for use in connection with any cooking range or cooking apparatus of a building occupied as a hotel, tavern or eating house shall be surrounded with fire bricks at least eleven and a half centimetres thick for a distance of at least three metres in height from the floor on which such furnace of copper, steam boiler, close fire cooking range or cooking apparatus is constructed or placed;
(x)Chimneys should not rest upon or be carried by wooden beams, wooden brackets or wooden floors nor be hung from wooden rafters. Iron brackets or stirrups attached to wooden construction should not be used to support chimneys;
(xi)For exterior chimney or chimneys having a wall exposed to the weather, all such exposed walls should not be less than one brick twenty to twenty five centimetres thick;
(xii)Connections between chimneys and tiled roofs should be made with sheet metal cap flashing arranged to overlap roof flashing and allow for slight movement that may occur between chimneys and roofs; and
(xiii)Wooden beams, joists or rafters should in contact with outside face of the chimney shaft.