How big should chimney flue be?

How is a chimney constructed?

Built of either brick or stone, traditional masonry chimneys include a firebox (where the wood burns) in addition to a flue, which is the air shaft running through the interior of the chimney, from the firebox up through the roof.Mar 15, 2021

Does a chimney flue have to be straight?

6 Answers from MyBuilder Chimney & Fireplace Specialists

The straighter the chimney the better it works and at least 80% of the chimney must be vertical. In a factory made system (twin wall flue) there can be a maximum of 4 bends with a 45 degree bend counting as one and a 90 degree bend counting as two.
Jun 12, 2019

How thick is a chimney flue?

Chimney wall thickness should be a nominal 4 in. (100 mm) unless no flue liner is used, in which case a nominal 8 in. (200 mm) is required.

What is the 2 10 rule?

This rule means that they must extend 3 feet above the roof penetration on the shortest side, and the top of the chimney must be 2 feet higher than any portion of the building structure within 10 feet.Jul 22, 2015

image-How big should chimney flue be?
image-How big should chimney flue be?

How do I know what size flue I need?

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.


Can you have a 90 degree bend in a chimney?

There must be no bends greater than 45 degrees and there must be no more than four bends in the chimney. If you are using four bends then you must have a soot door between the second and third bend (Building Regs). Note that a “T” off the rear of the stove is classed as two bends (2×45=90).


Can a chimney flue be horizontal?

As excessive bends and horizontal runs can accumulate soot with the risk of blockage, the flue pipe should be kept as vertical as possible and the angle of bends should be no more than 45° from the vertical.


How many bends can a flue have?

If bends are unavoidable, then there must be no more than four bends in the length of the chimney. A bend should be no more than 45 degrees from the vertical, with the exception that 90-degree factory-made bends or tees may be treated as two 45-degree bends.


What type of brick is used for chimneys?

What Type of Bricks Are Used for Chimneys? Typically, clay or calcium bricks are used to construct chimneys. Each brick has different durability based on the mortar and detailing of the chimney terminal.


How much does it cost to build a brick chimney?

How much does a new brick chimney cost? A new brick chimney costs anywhere from $60 to $200 per linear foot. A 15-foot chimney would cost $900 to $3,000. Installing a brick fireplace adds another $2,000 to $5,000 to the project, totaling $2,900 to $8,000.


How many bricks are in a chimney?

On the exterior, the chimney is brick and the wall is veneered with brick. In all, this fireplace required 75 firebrick for the firebox, about 600 brick for the backup walls and throat, 700 brick for the shell and 1,100 brick for the chimney.


What is the difference between 60cm and 90cm chimney?

If you have a stove with two burners or less you can go for a 60 cm chimney. But if your stove has 3 burners or more you should opt for a 90 cm chimney.


What is the size of a chimney brick?

Most bricks are made to be 8 inches by 4 inches. Despite their common size, there are many different types of bricks to choose from when it comes to masonry.


What's the difference between a chimney and a flue?

  • As nouns the difference between flue and chimney. is that flue is a pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace) while chimney is a vertical tube or hollow column used to emit environmentally polluting gaseous and solid matter (including but not limited to by-products of burning carbon or hydro-carbon based fuels); a flue.


What does a chimney and flue really do?

  • Chimney Liners. A flue lining in a masonry chimney is defined as "A clay, ceramic, or metal conduit installed inside of a chimney, intended to contain the combustion products, direct them to the outside atmosphere, and protect the chimney walls from heat and corrosion.".


Does My Chimney need a flue liner?

  • It is this last issue which causes most concern. The solid fuel association and building regs have always insisted a flue liner is only needed if the chimney is proven defective, especially if smoke and/or fumes are leaking into the property, or the chimney is oversize for the appliance.


Does your chimney need a flue liner?

  • If you spot areas with these issues, you need a flue liner. Also, if the chimney doesn't stick out 3 feet from the roof, you will need a flue liner. After that, inspect the entrance of the chimney. Any signs of discoloration or staining means the chimney requires a flue liner.

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