Home Guides and Articles
The Basics Of The Fireplace Flue

The Basics Of The Fireplace Flue

If you've ever looked inside the vent that smoke exits your fireplace through, you may have wondered "What is that thing called?" Well, that is the flue! Some people refer to the entire structure as the chimney. Others may get confused and call it a "flute" or a "flume." Though many people call all parts of the vent pipe the "chimney", the interior part of a chimney is called the flue. It is there to help exhaust fumes exit your fireplace as well as protect the exterior part of the chimney from chemical breakdown.

The flue has a damper near the bottom of the pipe or flue tiles and top of the firebox. This opening can operate by a handle or a latch. The damper is there to allow smoke to exit as you use the fireplace or to keep rain and debris out when you aren't using it. The damper will be your best friend if you want to get the best use out of your fireplace. So it's wise to get comfortable with how to use it as soon as the fireplace is installed.

The Basics Of The Fireplace Flue
viewing a flue from the bottom

While it may seem silly to worry about opening and closing it, and maybe you think keeping the flue damper open all the time sounds like a good idea, it isn't. As we just said, rain and debris can get in through a flue that stays open. But you can also lose air conditioning circulating through your house in the summertime if you keep the damper open year-round. The damper is made to let exhaust exit the room, but it can also let all other air escape if you allow it to.

The Basics Of The Fireplace Flue
cleaning creosote from vent pipe

One last thing to keep in mind about your flue is maintenance. If you have a wood burning fireplace, you will need to do regular cleanings with a chimney brush as well as call a chimney sweep out once a year. Wood burning fireplaces put off creosote and if that builds up in your flue over time, it can cause damage to the flue or even a fire. So make sure you are doing regular checks for creosote build-up and open dampers.

For today, that is all we will discuss about the flue. Thank you for reading. If you have any questions about what we've discussed please feel free to call us at 800.203.1642 or you can check out articles on chimneys and venting here.

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.

Customer Q&A with Product Specialists

Marty T. from Arizona asked:
Can I use 2 six inch flue instead of one 12-inch?
Can I use 2 six inch flue instead of one 12-inch?
This may be possible on a custom-built or site-built masonry fireplace.  However, this is not permitted on manufactured fireplaces that have an assigned model of chimney pipe that must be used to vent it.
Answered by: on Feb 21, 2024


Showing 1 of 1 Questions and Answers
Ask a Question