As a general rule the diameter of the chimney should match the flue collar on your wood stove.
Flue size kitchen chimney size chart.
Required chimney area can be calculated as.
Design velocities of larger furnaces should not exceed 10 m s.
31 chimney sizes for appliances needing draft.
For example you could vent a 6 inch stove into an insulated chimney that is 8 inches in diameter.
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.
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.
With that in mind the height of the chimney should be at least 15 feet from the floor of the fireplace to the top of the flue.
Once you have that number you can search for a slip in chimney cap of the same size.
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.
Dimensions for square rectangular and round clay flue liner.
For example an 8 x 8 square nominal clay chimney flue tile liner has inside dimensions of 6 3 4 x 6 3 4.
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.
Solving your chimney s math.
The ideal flue size is typically determined by the exhaust outlet of the stove or appliance.
This article series provides information about masonry fireplaces.
Then you can search for a chimney cap designed to fit an oval opening of those dimensions.
In most cases a step up is also fine.
Fireplace flue size specifications relation of fireplace size to flue opening dimensions table of required chimney flue size and flue dimensions for masonry fireplaces.
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.
An appliance operating at a steady state efficiency over 83 percent may be.
Chimney height also plays a role and taller chimneys generally draft better than shorter ones.
The velocity of air and flue gas in a smaller furnace should not exceed 2 m s.
Venting a wood stove.
10 3 32 chimney sizes for neutral draft equipment.
A 6 inch stove requires a 6 inch flue.
The most popular range of sizes.
You need to measure the outside length and width of your flue in order to cap an oval chimney termination.
Figuring out the proper size for your chimney flue can seem like a challenge.
A cross sectional area of chimney m 2 q volume of flue gases at chimney temperature m 3 s v velocity m s.
Net flue gas temperature rise above ambient and flue gas composition co2.
