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Flue Pipe, Class A Chimney Kits and Liners for US Homes
UL 103 HT listed Class A chimney systems with a limited lifetime warranty and free flue design
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Flue Pipe for Your Stove: Stove Pipe, Class A Pipe and Liners
Flue pipe carries the smoke and combustion gases, carbon monoxide among them, from your stove to the outside. Which pipe you need depends on where it runs: stove pipe in the room, Class A pipe through the house, or a liner in a masonry chimney.
It is not quite the same thing as a chimney: the flue is the passage the smoke travels through, and the chimney is what houses it, a masonry stack or an insulated Class A pipe.
In the room, use black stove pipe, single wall or double wall. Where the run passes through a ceiling, wall or roof, it continues in Class A chimney pipe, listed to UL 103 HT, joined to the stove pipe with the adapter made for it. If you have a sound masonry chimney, a stainless steel chimney liner runs up inside it instead. Not sure which route fits your house? Send us your measurements for a free flue design, or call us on 888-834-0880.
At Flue-Pipes.com, we specialize in providing top-tier chimney solutions, with experience since 2011 in selecting, fitting, and installing chimney liners and class A insulated pipes. Our expertise has helped countless homeowners and businesses improve the safety and warmth of their buildings.
We put tremendous effort into providing our customers with unparalleled assistance before, during, and even after installation.
Our goal is to ensure you make the correct choice for your chimney pipe solution from the start.
Our Commitment to Quality
We only sell UL listed Chimney Liners and Chimney Pipes. All our flexible liners and lining systems come with our Limited Lifetime Warranty. You can choose from single-wall stove pipes, Class A insulated chimney pipes, and chimney liners — all stocked and ready to ship the next day.
What’s the Difference Between Stove Pipe and Class A Chimney Pipe?
Stove pipe is used inside the room only to connect your stove to the chimney. It is not UL 103 HT rated and cannot pass through walls, ceilings, attics, or roofs. Available types:
- Single-wall stove pipe: clearance to combustibles = 18 inches
- Double-wall stove pipe: clearance to combustibles = 6 inches to walls and 8 inches to ceilings
Class A chimney pipe (also called "double wall insulated chimney pipe") is used for passing through ceilings, walls, attics, and roofs. It is always UL 103 HT listed and rated to withstand chimney fire conditions up to 2100°F. It requires only 2 inches of clearance to combustibles.
Important: Stove pipe and Class A chimney pipe are not interchangeable. A tested transition support or adapter must be used between them.
Top Quality Stainless Steel Chimney Pipes and Chimney liners
All our Class A Chimney Pipes are made of stainless steel, and our Class A insulated chimney pipes are made with the highest-quality ceramic wool for the best insulation.
We ensure you get a high-performing and consistent outflow of waste gases via the chimney pipe from your home so that you are consistently safe and warm with your stove or fire.
Our products can be used both inside and outside the house and are suitable for:
- gas,
- coal,
- wood stoves,
- pellet ovens,
- oil heaters.
Chimney pipes at flue-pipes.com
View our Installation Guides
View our Installation Guides
It is important that the installation guides are followed as well as relevant building and safety codes. View our guides
Flexible Chimney Liners to Secure Your Comfort and Style
Is your chimney deteriorating and does not work as efficiently as before? Flue-Pipes.com has a cost-effective and quick solution to your problem: a stainless steel liner. Installing a chimney liner is a seamless upgrade that you can do yourself! Follow our instructions that involve standard DIY tools, and tackle the entire job yourself.
A flexible chimney liner is exactly what you need to:
- reduce the risk of carbon monoxide leaks,
- reduce the risk of chimney fires,
- prevent pesky creosote buildups.
But that's not all – our chimney liners also enhance the energy efficiency of your stove or burner, making fireplace maintenance a breeze.
Our Best-Selling Products
Stove 'Connector' Pipes to Ignite Style and Safety
At Flue-Pipes.com, you can purchase durable and stylish chimney parts. Transform your chimney into a timeless addition to your room’s decor – not only bringing warmth to chilly nights but also elevating the overall aesthetics.
- Single wall stove pipe – Comes in a standard matte finish for visible piping (clearance to combustibles 18").
Whether you decide on our black stove pipe, or our Class A stainless steel chimney pipe, they fit easily together using the proper adapter.
Class A Chimney System for Modern Chimneys
Settling in a new place or upgrading an existing one? You will need Class A insulated stove pipes – a system that offers a safe, effective, and easy-fit heating solution.
At Flue-Pipes.com, we offer a reliable and safe Class A chimney pipes for wood burning stoves for indoor and outdoor use, passing through roofs and floors. Ideal also for gas coal-effect fires, or oil boilers, our double wall insulated chimney pipes ensure a reliable chimney, even without a brick chimney stack.
For an effortless installation, Flue-Pipes.com includes free locking bands for all Class A insulated systems and pipes.
What Size Flue Pipe Do You Need?
Match the flue pipe to the outlet of your stove. Flue pipe is sized by its inside diameter, and the stove’s installation manual gives the size of its outlet; most wood stoves use a 6 inch outlet.
Our flue pipes start at the stove: single wall 6 inch stove pipe and 8 inch stove pipe, and 6 inch double wall stove pipe and 8 inch double wall stove pipe.
For a masonry chimney, our chimney liner kits come in 4, 5, 5.5 and 6 inch, so the liner matches the outlet; an open fireplace needs a larger liner than these kits offer, so they do not suit one. For a new chimney through the roof or the wall, our wood stove chimney kits bring the parts for one route in one order. Parts from different makers do not fit together, so a run is ordered as one matched system rather than mixed piece by piece.
Can Flue Pipe Touch Wood?
No. Every kind of flue pipe keeps a gap to wood and other combustible material, and the gap depends on the kind of pipe.
Per NFPA 211, single-wall stove pipe (the connector pipe inside the room between the appliance and the Class A chimney) must maintain at least 18 inches of clearance from any combustible wall, ceiling, or framing.
Our guide to the chimney and the flue sets out the U.S. clearances in one table. The double wall stove pipe we sell is listed to 6 inches from walls and 8 inches from ceilings. Class A insulated chimney pipe keeps at least 2 inches to combustibles, per the installation instructions of the system installed. Those instructions, and the listing of the pipe you install, set the figure.
Brick or stone applied over a wood-framed wall does not count as non-combustible: it conducts heat through to the framing behind it, so the gap is measured to that framing rather than to the face of the brick.
Frequently Asked Questions
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What is the difference between a chimney and a flue?
A flue is the channel, pipe, or tube through which gases and smoke travel from the fireplace to the outside. A chimney is, on the other hand, in its simplest definition, the housing that encases the flue. There’s a misconception that masonry chimneys are simply made of brick. This isn’t true. The uneven and porous surface of brick provides a space for combustion byproducts to accumulate. This is a major fire hazard. Therefore chimneys are lined with a flue, so the smoke passes over a smooth surface that helps prevent excessive accumulation of combustion byproducts and minimizes the chance of fire. Read our full article on chimneys and chimney liners here.
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What does open flue mean?
An open flue typically consists of a pipe to carry combustion gases from the fireplace, while fresh air enters the fireplace via the casing. So for safe operation, additional air vents are required in the room where the appliance is installed to re-supply fresh air.
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Does a chimney need a liner?
If you are installing a chimney in a newly built property and you want to use it for an open fire, wood-burning stove, or gas fire, then the chimney does need to be lined. In an older property, have the chimney inspected before you connect a new stove: the inspection shows whether the chimney is fit to use, and the stove's instructions and your building department say whether it must be lined.
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How does a chimney work?
Chimneys operate on the principle that hot air rises above cold air. Hot exhaust gases and ash are lighter in weight than cold outdoor air. The chimney directs exhaust from these lighter gases from a fireplace upward to vent outdoors into the atmosphere. Additional air vents are required in the room where the appliance is installed to re-supply fresh air.
