Can I use a 5” diameter flue liner?
You can use a 5” diameter flue liner if you have a DEFRA approved stove and the manufacturer clearly states this is compatible. The size of the stove collar does not necessarily correspond to the size of flue liner you need.
What size chimney liner do I need for my Chimney?
In most cases, fireplace inserts require 6 inch diameter chimney liner. Woodstoves generally require between 6-8 in diameter chimney liner. In any situation you should first consult the manufacturers instructions of your appliance before installing a liner. Open Fireplace Liner Sizing Guide. The chart below uses a 10-1 ratio.
What size diameter&length liner do I Need?
How do I know what size DIAMETER & LENGTH liner I need? For Hot Water Heaters and Oil Furnaces the ideal diameter of the liner needed to vent your appliance is the size on your unit. For example, if it has a 6" opening where the pipe is to be inserted, that is the ideal size liner you need.
What size vent liner do I need for an oil furnace?
For Hot Water Heaters and Oil Furnaces the ideal diameter of the liner needed to vent your appliance is the size on your unit. For example, if it has a 6" opening where the pipe is to be inserted, that is the ideal size liner you need.
How do I know what size flue liner to use?
The ideal flue size is typically determined by the exhaust outlet of the stove or appliance. 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.
What size chimney liner do I need for a wood stove?
In most cases, fireplace inserts require 6 inch diameter chimney liner. Woodstoves generally require between 6-8 in diameter chimney liner.
What size chimney liner do I need for an oil furnace?
For Hot Water Heaters and Oil Furnaces the ideal diameter of the liner needed to vent your appliance is the size on your unit. For example, if it has a 6" opening where the pipe is to be inserted, that is the ideal size liner you need.
Can I use a 5 inch flue on a 6 inch stove?
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.
Can I use a 5 inch flue liner?
The general rule is as follows: For a stove of up to 20kW a minimum of 6” diameter flue is needed. You can use a 5” diameter flue liner if you have a DEFRA approved stove and the manufacturer clearly states this is compatible.
Do wood burning stoves need chimney liner?
Is a chimney liner necessary? A chimney liner is obligatory if you are installing a woodburning stove, gas fire or open fire in a new build property to comply with Document J of current Building Regulations. A chimney liner may be necessary in an older property if the flue inside your chimney is no longer safe to use.
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.
Can a flue be too big?
When a flue is too big, the chimney can be too cold. Cold chimneys make keeping a fire lit more difficult. They also lead to condensation and possible mold inside the chimney brickwork. They key to making and keeping a great draft in your fireplace is making sure the proper sized flue is installed.
Does chimney diameter affect draft?
in height sometimes produce more draft than the appliance needs, so a smaller chimney can be used without any reduction in performance.
Can a stove pipe be too big?
Chimney sizes smaller than the stove's outlet are almost never allowed. Larger chimney pipe can work as long as the chimney is otherwise well-designed. A 3" stove can use a 4" or 5" roof exit.
Can I reduce an 8 stove pipe to 6?
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 increaser is going from 6" stove pipe to 8" chimney pipe. A common installation for using an reducer is going from 8" stove pipe to 6" chimney pipe.
Do chimney liners need to be insulated?
As noted above, insulation is required for any liner used for venting solid fuel appliances. But there are advantages to having a chimney liner insulated even if it's venting gas or oil appliances, especially if the flue being lined is on the outer wall of a house rather than in the interior.
What type of chimney do I need for a wood stove?
We recommend 316-grade chimney liner for stoves that will be used for burning seasoned wood and occasional use of smokeless coal. We recommend 904-grade chimney liner for stoves burning a mix of seasoned wood and smokeless coal or smokeless coal on its own.
What kind of chimney liner do I need?
Stainless will always be the best option when it comes to performance, durability, safety and cost. A stainless steel chimney liner that is properly sized, for the stove, furnace, or fireplace will maintain or improve the venting performance (draft).
How do you size a chimney flue?
If the flue is circular, then it should be at least one-tenth the size of the fireplace opening. Flues should also mirror the size of a chimney. If a chimney's diameter is six inches, then the flue should also measure six inches. Again, if the flue is too big, though, it can mean the fire cools too quickly.
What kind of chimney do I need for oil furnace?
The pipe you should use to exhaust may vary depending on your situation. Single-wall pipe is the most commonly used oil-burning connection to a clay-lined brick or lined chimney. A lined chimney is a flexible pipe that goes inside a possibly damaged brick or clay chimney.
What type of flue liner do I need?
Back in the 1960s, chimneys were lined with clay. Today, most chimneys are being lined with flexible steel liners. For a solid fuel burning stove, make sure you choose the right type – don’t use one intended for a gas fire or stove, as it won’t be safe.
What is a flue liner?
A flue liner is just what it sounds like! Also often referred to as a chimney liner, a flue liner is a flexible tube that is connected to your stove pipe to line the inside of your chimney. It runs up the entire length of your chimney, carrying the fumes up your flue liner instead of releasing them straight into your chimney cavity.
How Much do Chimney Liners Cost?
The cost of lining your chimney is very much dependent on what diameter flue liner you need, how long you require it and what grade you go for.
How long is a chimney flue liner?
If your stove collar (where you attach the stove pipe) is 5” but you need a 6” flue liner, adapters are available for you to do so. When it comes to length, you need to ensure you have a flue liner long enough to reach from the top to the bottom of your chimney.
What are flue liners for wood stoves?
A lot goes into installing a stove – once you have chosen your favourite style, you’ve then got to make sure you have all the parts in their right places! Flue liners for wood burners are one of the most important pieces of the puzzle. Something of the back bone of your stove, they are responsible for making sure you can burn your fuel effectively ...
Why do chimneys need lined?
Blockages are a very common cause of chimney fires. A lined chimney also helps protect you from carbon monoxide leaks. If any cracks form in your chimney that you are unaware of, dangerous fumes can leak out. A flue liner offers increased protection against this happening.
What is the best flue liner for burning wood?
There are two different grades of flue liner: 316 grade – this is cheaper but fine to use if you are burning seasoned wood only. 904 grade – more expensive but also more durable. You should use this grade if you plan on burning coal frequently.
What type of flue vent is used in double wall chimneys?
At double-wall B-vent chimneys the flue vent connector between the appliance and the chimney entry point may be single-wall metal flue vent connector or it may be a double-wall Type-B flue vent material.
What is a flue vent connector?
1. A flue vent connector is the horizontal/sloped metal pipe connecting the heating appliance to the entry point of the chimney. Flue vent connectors and their materials, sizing requirements, & fire clearances are. at FLUE VENT CONNECTORS, HEATING EQUIPMENT.
What size vents are used for a 1992 GAMA?
The result of those calculation using a 38,000 BTU water heater with a 3" draft hood and a 37,500 BTU boiler with a 4" draft hood connected to a 20' high chimney is to use a common flue with an area of 28 square inches or a 6" flue vs a 5" flue in the previous examples.
How tall is a chimney?
Your chimney cross section area is 8 x 13" = 104 sq.in. Your chimney height is 30 ft. (which gives good draft).
Does a chimney flue reduce draft?
Yes, Flue, going to a smaller diameter main flue in a chimney may reduce the draft. The total effect depends on several variables including chimney height, ambient temperature range, and oil burner/heater input BTUH and burner adjustments.
Is it safe to vent a chimney?
Generally a larger vent is functional and safe as long as the chimney size and height are not so large that the heating appliance won't develop adequate draft. It's not just stove pipe size you need to consider, but proper fire-rating of the flue or chimney materials, clearances from combustibles, cleanout access and code.
Why is it important to choose the right size chimney liner?
Choosing the correct size liner for your appliance is crucial to ensure your appliance or stove is running properly. The chimney liner should never be undersized for any appliance, especially to accommodate insulation around the liner. The liner size is the number one factor for the appliance to burn properly.
Why do I need to choose the correct size chimney liner?
Choosing the correct size liner for your appliance is crucial to ensure your appliance or stove is running properly. The chimney liner should never be undersized for any appliance, especially to accommodate insulation around the liner. The liner size is the number one factor for the appliance to burn properly. Undersized liners will not allow the appliance to vent properly. This can cause smoke to pour out of the stove and it can also cause gas and oil appliances to fail. The ideal flue size is typically determined by the exhaust outlet of the stove or appliance. 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.
How many inches of liner for a natural draft appliance?
IF it's a natural-draft appliance, with 20' or less of lateral distance, you would need a 7" liner.
How far from chimney is a chimney draft?
It is a natural draft appliance, and it is just a hair less than 20' from the chimney, so it looks like 6" will do the job.
How many BTU's does a 6" handle?
6" would only handle about 230,000 BTU's in your situation.
Choosing a Length
The best way to size your chimney liner is by dropping a tape measure from the top of the chimney crown and measure the distance from that point to the thimble or opening where your appliance or stove will connect to the chimney. It’s always a good idea to add an extra foot or two just in case.
Choosing a Diameter
A general rule of thumb is to see what size outlet is on your stove or appliance. In most cases, fireplace inserts require 6 inch diameter chimney liner. Woodstoves generally require between 6-8 in diameter chimney liner.
Open Fireplace Liner Sizing Guide
The chart below uses a 10-1 ratio. A 10-1 ratio should be used for chimneys less than 25 feet in height and a 12-1 ratio for chimneys greater than 25 feet in height.
Choosing a Diameter for Non-Round Pipe
These charts will help you find the dimensions of ovalized,squarized, and rectangularized pipe. Start by finding the pipes minor outside dimension from the left side of the chart. Move across to the right to find the major outside dimension. Then move up to the topmost header. This will give you the round pipe size you will need before ovalization.
How to measure flue liner length?
To measure the length you need, measure from the top of the chimney flue tile or crown, down to the thimble where the liner will come through your wall to hook up to your appliance. Fireplaces. For your Fireplace, you need to calculate the maximum size flue liner you can install.
How to measure for wood pellet stove liner?
If you are relining for a Woodstove, Corn or Wood Pellet Stove you need to measure from the top of the chimney crown down to where you will hook-up the stove. For the diameter liner size, you will need to measure the inside dimension of the exhaust on your stove.
What happens if you have an undersized chimney liner?
An undersized chimney liner for a boiler or furnace will cause a limit switch to trip, turning the appliance off. Understanding what measurements and what information you need is crucial for a safe and successful installation.
Where is the specs panel on a gas liner?
Most of the time the specs panel is on the access door to the burners. This is the absolute most important piece of information in order to size a liner for a gas or oil appliance. Usually furnaces and boilers will have an exhaust hole that is much smaller than what liner size is required. TIP: Never size a liner based on the size ...
How many 90 degree elbows should a connector pipe have?
A connector pipe should never have more than 3 total 90 degree elbows in the system. We also need to measure the lateral length form the appliance to the chimney. The final measurement we need to determine the correct size liner is the height of the chimney.
What is the ratio of unlined chimney flues?
Un-lined chimney flues are also specified as larger than lined installations and use the 1/8 ratio we explained above.
Where to find effective area and flue size tables?
You can find effective area and flue size tables in the Uniform Mechanical Code and in the MIA's Masonry Fireplace & Chimney Handbook and also in NFPA 211 - Standards for Chimneys & Fireplaces. [9] [10] [11]
How much of the chimney area should be in a fireplace?
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. [Click to enlarge any image]
Which flue has better draft?
At FLUE SIZE SPECIFICATIONS where we discuss chimney flue sizing for venting heating appliances such as boilers, furnaces and water heaters, we explain that in comparing two flues of exactly the same square inches of cross-sectional area, a round flue will have better draft than a rectangular one.
What is the FHA chimney ratio?
The FHA requires using a 1/8 ratio instead of 1/10 for chimneys that are less than 15 feet high and the 1/10 ratio for chimneys that are 15 feet or more tall . [9]
Is sharing a fireplace flue a code violation?
Sharing a fireplace flue is asking for trouble in draft as well as raising safety and fire spread concerns (which is why it's a code violation).
Do you need a non-combustible hearth for an elevated fireplace?
Roger I don't have the full picture of your installation, but a general answer is yes you need a non-combustible hearth even for an elevated fireplace. Depending on the type of fireplace and fuel, at some height the worry about radiated heat damaging the floor would of course diminish, or fall to nil.
