Chimneys & Venting

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Need replacement chimney parts for chimney repair? Or need to perform routine chimney flue maintenance, we offer everything you could need to keep your fireplace running smoothly. We have a wide selection of chimney caps, flue pipe caps, stove pipe caps, and chimney liners to fit any stove or fireplace. If you need maintenance supplies, also check out our vast options of brushes, cleaners, sealants, and more! Don't get caught unprepared, stock up on these great products and receive free shipping for orders over $99!

Different types of fireplaces require unique cleaning processes and products. Depending on the kind of hearth appliance you have, the selection will change. If you have any questions about what is best suited for your needs, don't be afraid to contact our NFI certified technicians!

With wood-burning stoves and fireplaces, creosote will build up in the chimney. Creosote is a sticky residue that adheres to the inside of the firebox and chimneys and often associated with higher pollution rate. The buildup is usually caused by using firewood with a high concentration of resin or wet firewood. If you are dealing with first or second stage creosote, check out our chimney brushes and cleaners to find what you need to take care of the mess.

Although maintaining pellet and gas stoves is much simpler than the wood-burning variety, consistency is the key to keeping it straightforward. It is recommended that you perform an in-depth inspection annually. As a note, unless you are very familiar with the parts and operation, it is a good idea to hire a professional to do this job. In addition, you should regularly empty the firebox and clear out any dust or soot; also, make sure that the door is secure to avoid leaking carbon monoxide into your home!

Chimneys & Venting Q&A with the NFI Certified Specialists

* Please Note: All customer questions are answered by our NFI Certified Specialists free of charge!

13 Questions & 13 Answers

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Chuck B.

from Poplarville, MS asked:

December 18, 2019

Do you have to install a chimney liner when you get an insert? Why won't it work with a regular chimney?

1 Answer

A stainless steel liner is indeed required when installing a woodburning fireplace insert. The reason is that the inserts are so efficient, they must have a dedicated flue connection from the insert to the top of the chimney to maintain proper draft and flow. Otherwise, you will struggle to keep fire lit and the door may need to be opened. This is not ideal for operation and impacts efficiently greatly.

Submitted by: Tyler M. - NFI Master Hearth Professional on December 18, 2019

Answer

Mark M.

from Temecula, CA asked:

December 14, 2019

I need to replace the gasket behind the pilot, on and off knob. The gasket seats the the sections between the valve and body. I cannot find a replacement and was wondering if using material like a tire inner tube would work?

1 Answer

We do not recommend trying to use other materials to replace these parts. We recommend contacting your unit's manufacturer for details on what you may be able to do.

Submitted by: Tyler M. - NFI Master Hearth Professional on December 16, 2019

Answer

Michael M.

November 20, 2019

What is a thimble, and what does it do?

1 Answer

It allows the safe passage of venting pipe through a wall.

Submitted by: Owen O. on November 21, 2019

Answer

Max P.

from British Columbia, CAN asked:

November 8, 2019

I have bought a wood-burning fireplace WCT2042WS and there were no instructions regarding the chimney installation and the clearances. Could you please give me that info?

1 Answer

Please follow this link.�

Submitted by: Will M. on November 8, 2019

Answer

Patricia F.

from Charlotte, NC asked:

September 16, 2019

We recently bought a house that has a ventless gas fireplace and whenever we use it there is a terrible smell, almost like gas. The gas company checked and there is no leak and stated the smell is because it's ventless. Is there any way to vent this fireplace?

1 Answer

Unfortunately, ventless systems may not be vented. If you have natural gas, I recommend having the system serviced and cleaned as this may eliminate the odor. If not, certain types of ventless systems are more prone to producing odor than others, so the only option might be complete replacement.�

Submitted by: Will M. on September 17, 2019

Answer

Barry

from Ft Collins, CO asked:

August 30, 2019

What kind of pipe vent do I need for a wood-burning stove?

1 Answer

If your clearance to a combustible wall is 18 inches or greater you can use single wall black stove pipe, and those are available in 24 and 22 gauge. If your clearance is less than 18 inches, but greater than 6 inches to the wall, you would need to use the double wall black stove pipe. That pipe would terminate just before a wall or ceiling and you would then transfer to the chimney components.

Submitted by: Kathy O. on September 4, 2019

Answer

Holly

from Rocklin, CA asked:

March 21, 2018

Where can I find Temco fireplace replacement pipe? Had a chimney fire. Need 22 feet. Model #TCH4125 serial #AF291082

1 Answer

Unfortunately, we do not have any Temco chimney available as this company has been out of business for quite some time and all stock of their manufacturer-specific chimney lengths have been depleted.

Submitted by: Will M. on March 22, 2018

Answer

Bob

from Bellingham, WA asked:

February 24, 2018

I bought a used gas fireplace/stove that came with more chimney vent pipe than I will need to install in my manufactured home. The double wall vent pipe chimney is 7" diameter with a 4" pipe inside. The chimney will go through the ceiling and then through the roof. I believe it will be exactly vertical from the stove through the roof with no bends. Can you tell me what to look for in your store for a piece to keep the vent pipe away from the ceiling and going through the 4" of insulation above?

1 Answer

That would be an Attic shield

Submitted by: Owen O. on February 26, 2018

Answer

Clark

from Denver, CO asked:

January 31, 2018

what venting parts are needed for the mirage outdoor with BBQ

1 Answer

If you are referring the the Mirage Stone line of outdoor fireplaces we offer, these should not be connected to any chimney system and should simply be placed at least 10' away from a home or structure and not underneath any sort of covering.

Submitted by: Will M. on January 31, 2018

Answer

Lee

from WA asked:

November 5, 2017

I am constructing a class B-type flue system for a Williams furnace 6551921. I plan to place it on top of a wooden room in my all metal RV barn. It is 60" to the metal roof and I have obtained 7' of B-type exhaust piping. Is there any recommendation on how to deal with the area where the flue pipe goes through the metal roof?

1 Answer

If you are going through a metal roof without contact to combustibles along the way, then you only need to cut out a hole with the proper clearance required for your pipe as listed by manufacturer. Above the roof, you will need a flashing, storm collar, and cap.

Submitted by: Kelsey C. on November 6, 2017

Answer

Ralph

from Wenatchee, WA asked:

June 29, 2017

I have a direct-vent gas fireplace and live in a very snowy area. Is there a vertical chimney cap designed for heavy snow, or do I need to use a horizontal vent cap? Thank you.

1 Answer

On Direct Vent unit you have the choice to either vent the unit vertically or horizontally. In a heavy snow area you will have to watch for high build up of snow on the roof which can also block the cap. Some units have a horizontal "snorkel termination" that also may help your situation.

Submitted by: Owen on June 29, 2017

Answer

Lynda

from NJ asked:

November 12, 2014

Do all FMI fireplaces have to have a damper installed?

1 Answer

Yes, that is correct. Fortunately, most of our FMI manufactured woodburning fireplaces have a pre-installed damper included.

Submitted by: Tyler M. on November 12, 2014

Answer

Howard

from Bangor, PA asked:

November 28, 2012

I need to discus my chimney setup.

1 Answer

If you need chimney pipe or stove pipe and are not sure exactly what you need, please complete the Chimney Pipe Design & Quote Form. One of our fireplace specialists will design your chimney installation for you. We will send you a quote via the email that you provide. Most installation designs and quotes will be sent within 1-2 business days.

Submitted by: Magan B. on November 28, 2012

Answer