You need to measure the outside length and width of your flue in order to cap an oval chimney termination.
Flue size kitchen chimney size chart.
Chimney height also plays a role and taller chimneys generally draft better than shorter ones.
In most cases a step up is also fine.
To provide adequate draft and safe venting of combustion products the chimney flue for a fireplace has to be adequate in size or cross sectional area.
Dimensions for square rectangular and round clay flue liner.
Net flue gas temperature rise above ambient and flue gas composition co2.
32 to 36 wide 25 to 29 high it is important for the size of the chimney to be correctly calculated to match the fireplace opening.
As a general rule the diameter of the chimney should match the flue collar on your wood stove.
Design velocities of larger furnaces should not exceed 10 m s.
A q v 3 where.
Fireplace flue size specifications relation of fireplace size to flue opening dimensions table of required chimney flue size and flue dimensions for masonry fireplaces.
A 6 inch stove requires a 6 inch flue.
For example you could vent a 6 inch stove into an insulated chimney that is 8 inches in diameter.
Once you have that number you can search for a slip in chimney cap of the same size.
A cross sectional area of chimney m 2 q volume of flue gases at chimney temperature m 3 s v velocity m s.
Venting a wood stove.
The venting capacity of a rectangular or square masonry flue if translated directly into actual or measured square inches of cross section is less than a round chimney flue of the same square inches of venting capacity.
The velocity of air and flue gas in a smaller furnace should not exceed 2 m s.
Required chimney area can be calculated as.
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.
The rule of thumb is a 1 10 ratio meaning that the fireplace opening can be 10 times as large as the flue tile cross section.
For example an 8 x 8 square nominal clay chimney flue tile liner has inside dimensions of 6 3 4 x 6 3 4.
Solving your chimney s math.
Quality chimney liner material that meets astm and excels in freeze thaw environments.
An appliance operating at a steady state efficiency over 83 percent may be.
Single flue chimneys with oval flues.
The ideal flue size is typically determined by the exhaust outlet of the stove or appliance.
The most popular range of sizes.
Figuring out the proper size for your chimney flue can seem like a challenge.
10 3 32 chimney sizes for neutral draft equipment.
31 chimney sizes for appliances needing draft.
