Should I use a Chimney Balloon, a Flueblocker, or a Chimella for my chimney?
A: This depends upon what problem you want to fix and what damper configuration you have. Use our product selector tool.
My damper is closed, but why is my fireplace so cold?
A: Metal dampers are 300+ year old technology, and they have some key weaknesses.
I closed the damper, but why does my fireplace stink in the summer?
A: Fireplaces are lined with odiferous ash and creosote, and they tend to reverse their draft in the summer.
I noticed that my heating bills go up when I use the fireplace. Why is that?
Fireplaces accelerate the stack effect in a house, and that wastes fuel and heat.
Read More About the Stack Effect and Fireplace Heat Loss Here
How can I stop bird and airplane noise from coming down the chimney?
A: Noisy birds hanging out at your chimney top can be annoying. There are some ways to mitigate the noise.
My energy audit said I need a Chimney Balloon. What size do I get?
A: A Chimney Balloon may be just what the doctor ordered for your chimney. But first visit our chimney product selection tool to see what type of damper and chimney configuration you have.
I don’t know a “flue” from a “flapper”. What are the parts of a fireplace?
Please see our diagram of the parts of a fireplace. It also includes definitions.
I have a Chimney Balloon, but it is deflating. Is it punctured, or is the valve bad?
Some chimney applications are just too rough for inflatable chimney plugs. But there are more durable options to plug your flue.
What is a chimney draft stopper?
A chimney draft stopper is a removable insert designed to reduce unwanted airflow through an unused fireplace. It helps keep conditioned indoor air from escaping while limiting cold drafts, dust, odors, and outside air from entering your home.
Why should I block an unused chimney?
An open chimney acts like an open window, allowing heated or cooled air to escape year-round. Installing a draft stopper helps improve comfort, reduce energy waste, and minimize outside air entering through the fireplace.
Will a chimney draft stopper lower my energy bills?
It can help reduce heating and cooling costs by limiting the amount of conditioned air that escapes through an unused chimney. While savings vary depending on your home and climate, many homeowners notice improved comfort and more consistent indoor temperatures.
Can I still use my fireplace?
No. A chimney draft stopper must always be removed before lighting a fire. Never operate a wood-burning or gas fireplace while the draft stopper is installed.
Can I leave it installed all year?
Yes. If your fireplace isn’t being used, the draft stopper can remain installed year-round. Just remember to remove it before using the fireplace.
How do I know what size I need?
The best fit comes from measuring the inside dimensions of your chimney flue. Once you have those measurements, you can use our sizing guide to determine the appropriate product.
Where should I measure?
Measure the inside opening of the flue where the draft stopper will be installed—not the fireplace opening or the exterior chimney.
What if my chimney is round?
If your chimney has a round metal or clay flue, measure the inside diameter. We’ll recommend the appropriate size based on that measurement.
What if my chimney is square or rectangular?
Measure the inside width and depth of the flue opening. Our sizing guide will help match those dimensions to the correct product.
What if my measurements fall between two sizes?
In most cases, choosing the slightly larger option provides a better seal. If you’re unsure, contact our team and we’ll help you select the best fit.
What if my chimney has an unusual shape?
Some chimneys have irregular, oval, or custom-built flues. If your chimney doesn’t match our standard sizing options, send us a few photos and measurements, and we’ll help determine the best solution.
Is installation difficult?
Most homeowners can install a chimney draft stopper in just a few minutes. No specialized tools or professional installation are typically required.
How high should I install it?
The draft stopper should be positioned inside the flue above the fireplace opening, where it creates a secure seal while remaining accessible for removal.
Can I install it from inside the fireplace?
Yes. Most installations are completed from inside the home without needing to access the roof.
Will it damage my chimney?
No. A properly sized draft stopper is designed to fit securely without causing damage to masonry or metal flues.
Does a draft stopper completely seal the chimney?
It significantly reduces airflow but isn’t intended to create an airtight seal. A small amount of natural air movement may still occur depending on your chimney’s condition.
Will it stop cold drafts?
It greatly reduces cold air entering through an unused chimney, helping eliminate uncomfortable drafts around your fireplace.
Will it keep insects, leaves, or debris out?
While a draft stopper helps reduce debris entering from the fireplace opening, it isn’t a replacement for a properly installed chimney cap, which protects the chimney from weather, animals, and falling debris.
How do I clean or maintain it?
Periodically remove the draft stopper and brush or wipe away any accumulated dust or soot. Inspect it before reinstalling to ensure it remains in good condition.
What if I'm not sure which product I need?
We’re happy to help. Simply send us:
- A photo looking up your chimney from inside the fireplace
- A photo of the fireplace opening
- Any measurements you’ve already taken
Our team can help identify your chimney type and recommend the correct product before you place an order.