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Chimney Pipe Buying Guide

Chimney Pipe Buying Guide

BY Collin Champagne Sep 21, 2025

Figuring out what kind of piping you need to install your fireplace, stove, or other hearth appliance can be intimidating. To simplify things, we will examine several aspects of the most common types of chimney pipe and explain their uses and applications.

Chimney Pipe Buying Guide

We plan to help you familiarize yourself with chimney and stove pipe. First and foremost, in any installation, you'll want to consult the owner's manual for your hearth appliance. Different fireplaces and stoves have varying venting requirements. These requirements involve more than just the kind of pipe you need, like the DuraVent chimney pipe; they also include specific information regarding clearances and offsets that require following for safe and proper installation. If anything in your manual is unclear or confusing, contact the manufacturer of your appliance directly for clarification.

But if you need further assistance reaching your manufacturer, please call us at 800.203.1642. Our NFI-certified specialists will be happy to help you in any way they can.

About the Author

Collin Champagne

With over 13 years in the industry, Collin is a National Fireplace Institute (NFI) certified technician and managed content for the eFireplacestore and eCanopy brands. He has achieved the highest NFI certification possible as a Master Hearth Professional and is certified in all three hearth appliance fields: wood, gas, and pellet. With experience with sales and in-field installations, his expertise shines through his technical knowledge and way with words.

Contact our NFI-Certified Experts Contact our NFI-Certified Experts

Customer Q&A with Product Specialists

Ted H. from Cody, Wyoming asked:
Does my double-wall pipe coming from the top of the woodstove go on the inside or the outside of the flue extension at the bottom of the square support box?
Does my double-wall pipe coming from the top of the woodstove go on the inside or the outside of the flue extension at the bottom of the square support box?
This should be installed outside of the collar on the support box.
Answered by: Devon P.

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Dennis B. asked:
I need to extend the portion of the the chimney above the roof. Currently, it is only approx 2' above the roof. The existing chimney is double wall with a chimney cap. Do I have to continue with double wall or can I use the much less exp
I need to extend the portion of the the chimney above the roof. Currently, it is only approx 2' above the roof. The existing chimney is double wall with a chimney cap. Do I have to continue with double wall or can I use the much less exp
Yes, by code, the same brand/model of chimney pipe must be used to extend your chimney.
Answered by: Tyler M. - NFI Master Hearth Professional

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Bill from Charlotte NC asked:
Can you use a flexible pipe on a direct vent gas fireplace rather than cut a stud? It is about a 3'' offset and will allow me to center the fireplace between two wall cabinets. Is this safe?
Can you use a flexible pipe on a direct vent gas fireplace rather than cut a stud? It is about a 3'' offset and will allow me to center the fireplace between two wall cabinets. Is this safe?

This will depend on the specific model.  Some direct vent gas fireplaces can utilize a flexible vent pipe, but others cannot.  This information will be stated clearly in the installation manual.

Answered by: Tyler M. - NFI Master Hearth Professional

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Bob M. from St. Paul, Minnesota asked:
I am replacing an existing stove that has an 8" stove pipe through to the roof. The new stove has a 6" outlet, thus sized for a 6" stove pipe. Can I install an adaptor that goes from 6" to 8" to avert changing everything on the roof?
I am replacing an existing stove that has an 8" stove pipe through to the roof. The new stove has a 6" outlet, thus sized for a 6" stove pipe. Can I install an adaptor that goes from 6" to 8" to avert changing everything on the roof?
We do offer 6" to 8" stove pipe adapters that increase stove pipe size before connecting to class a chimney.
Answered by: Jason W.

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