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In general, flue size should be 25 percent larger than the size of the stove pipe, which connects the stove to the chimney. This means a stove with a 6-inch diameter pipe would require at least an 8-inch flue; an 8-inch stove pipe requires a 10-inch flue, etc.
How do you size a flue pipe?
To determine the main flue size, refer to Figure 3 and locate the square inch area of each individual flue size. Next, total the square inch areas and refer back to Figure 3 to determine the pipe size the total corresponds with. In our example, 78.54 square inches equal a 10″ pipe size.
What size flue pipe do I need for furnace?
The average stove and furnace requires a 3 inch diameter pipe, but can be as large as 8 inches. A 4 inch pipe is needed for a pellet stove.
How do I know what size flue I need?
Get a tape measure. If you have a round flue, measure the diameter. If you have any other shaped flue, measure the depth and width of the narrow part just above the fireplace. Don’t worry if it’s an odd shape, just measure the longest parts and the wool felt will squash in to fit.
Can a flue pipe be too large?
Flue pipe is too big for the furnace. Excessively large flues reduce the velocity of the combustion products, allowing them more time to dissipate heat through the pipe walls. Flues that were acceptable for natural-draft furnaces are often too large for the new, 80% induced-draft furnaces.
How big should chimney flue be?
The area of the flue should be roughly 1/12th the size of the opening area. If the flue is too small, the fireplace will smoke. In this case, the taller the chimney the better – chimneys that are too short will cause draw issues.
Can you reduce a 6 inch flue to 5 inch?
Never step down in size anywhere on the flue route as this will cause a bottleneck and the smoke may back up, eventually filling from the stove (and it’s illegal). For example, if a stove has a 6″ collar it cannot have a lesser diamter flue size.
How do I size a boiler flue?
As a general rule, a flue should work effectively when it’s up to 10 metres in length. This is usually based on a standard thickness of 60/100mm. For flues that need to be longer than this, it’s a good idea to increase the thickness to 80/125mm to ensure that the gases are able to escape easily.
Can you have an open fire with a flue liner?
Chimney liners are safe if they are installed and used correctly. If you are intending to use an open fire, wood burning stove or gas fire in your home it is important to follow the safety instructions provided by the manufacturer. For example, chimney liners still need to be swept regularly.
What is the 2 10 rule?
A chimney must project at least 3 feet above the roof on its shortest side and also be at least 2 feet above any roof structure that is within a 10 foot radius of the chimney. That’s it. Following this simple rule helps to ensure other structures on the roof do not interfere with the exhaustion of combustion gases.
Are chimney caps standard size?
With masonry (at least here in the Kansas City Metro) the common sizes are 8 by 8, 8 by 13, 13 by 13, 8 by 17, and 13 by 17. Now they do make one size caps that fit all but they do not work properly, they’re a poor fit. My suggestion: get someone at the top of your chimney that knows how to measure for chimney caps.
Are chimney pots a standard size?
The Standard Chimney pot Cowl in terracotta fits flues and pot sizes from 125mm (5″) to 250mm (10″) internal diameter with the umbrella lid going to 300mm (12″) external diameter. The Standard Chimney Cowl is Terracotta Finish. The Chimney pot Cowl is simple to fit and reduces rain entry.
Can I reduce an 8 stove pipe to 6?
When the diameter changes, your stove is going to not be as efficient. We also recommend that you do not increase and decrease the size of your stove pipe to chimney pipe by more than 2″. A common installation for using an reducer is going from 8″ stove pipe to 6″ chimney pipe.
Is bigger stove pipe better?
Chimney Size Should Match the Appliance Now it is clear that bigger is not better when it comes to chimney sizing. A given volume of flue gas flows faster and has less time to lose heat in a small chimney flue than in a large one.
How big does a stove pipe need to be?
What size stove pipe should I install in my wood stove? A. To get that answer, all you need to do is look at your wood stove and measure the inside diameter of the flue collar on the wood stove itself. If the stove has a 6” flue collar, then you should use 6” stove pipe and 6” chimney pipe through the roof.
What is the standard size opening for a fireplace?
Standard Fireplace Opening Dimensions The standard height of a fireplace’s opening is between 24 to 29 inches and 24 to 36 inches wide.
