Chimney Flue Dimensions

Check with your local code enforcement officer or fire dept for proper installation.

Chimney flue dimensions.

Chimney vent capacity chart btu h and kw pdf. Thickness of a lined chimney to be used as a structural component is 10 in. An unlined chimney s minimum wall thickness is 14 in. Quality chimney liner material that meets astm and excels in freeze thaw environments.

A q v 3 where. They help protect the chimney walls from heat and minimize condensation. As a general rule the diameter of the chimney should match the flue collar on your wood stove. For example you could vent a 6 inch stove into an insulated chimney that is 8 inches in diameter.

The ideal flue size is typically determined by the exhaust outlet of the stove or appliance. For example an 8 x 8 square nominal clay chimney flue tile liner has inside dimensions of 6 3 4 x 6 3 4. 250 mm consisting of. 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 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. Socket type joints and self aligning joints are available in round flue liners. 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. 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.

In most cases a step up is also fine. Required chimney area can be calculated as. 100 mm bearing length brick. The diameter of the chimney cap you choose needs to be the same as your pipe s inner diameter.

A 6 inch stove requires a 6 inch flue. 50 mm of noncombustible material brick and 3 4 in. Terra cotta flue intent is to contain the combustion products and direct them to the outside atmosphere. Chimney vent capacity chart btu h and kw.

Just muliplying these dimensions together 6 75 x 6 75 45 56 sq in. Dimensions for square rectangular and round clay flue liner. 100 mm chimney wall brick 2 2 in. 350 mm consisting of the same elements.

A pipe with a seven inch inner diameter for example requires a seven inch chimney cap.