Chimney Flue Dimensions

An unlined chimney s minimum wall thickness is 14 in.

Chimney flue dimensions.

A 6 inch stove requires a 6 inch flue. A pipe with a seven inch inner diameter for example requires a seven inch chimney cap. For example you could vent a 6 inch stove into an insulated chimney that is 8 inches in diameter. Dimensions for square rectangular and round clay flue liner.

In most cases a step up is also fine. Quality chimney liner material that meets astm and excels in freeze thaw environments. The diameter of the chimney cap you choose needs to be the same as your pipe s inner diameter. A cross sectional area of chimney m 2 q volume of flue gases at chimney temperature m 3 s v velocity m s in general 1 kw boiler heat requires 1100 mm 2 of chimney area.

The outer wall of your pipe also needs to be covered by your cap but it doesn t matter if your cap extends beyond the edges of your pipe. Typical standards require a cross section area of the fireplace flue or chimney vent to be equal to 1 10 of the area of the fireplace opening itself for a conventional wood burning installation and without considering the effects of a glass fire door. 50 mm of noncombustible material brick and 3 4 in. Click to enlarge any image.

Chimney vent capacity chart btu h and kw. For example an 8 x 8 square nominal clay chimney flue tile liner has inside dimensions of 6 3 4 x 6 3 4. Socket type joints and self aligning joints are available in round flue liners. The ideal flue size is typically determined by the exhaust outlet of the stove or appliance.

Just muliplying these dimensions together 6 75 x 6 75 45 56 sq in. 250 mm consisting of. 100 mm bearing length brick. Required chimney area can be calculated as.

As a general rule the diameter of the chimney should match the flue collar on your wood stove. The rule of thumb for sizing a chimney liner is that you never want it to be smaller than the appliance exhaust hole and you don t want the liner to be three times the area of the exhaust hole of the appliance. Thickness of a lined chimney to be used as a structural component is 10 in. They help protect the chimney walls from heat and minimize condensation.

Check with your local code enforcement officer or fire dept for proper installation. Superior clay manufactures a complete line of vitrified clay flue liners from 3 to 36 diameters in round flue liners and from 4 x8 to 24 x24 in square and rectangular flue liners. A q v 3 where. Terra cotta flue intent is to contain the combustion products and direct them to the outside atmosphere.

100 mm chimney wall brick 2 2 in.