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Masonry Stove Improvements: Smoke By-pass

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Last summer, Dan built a masonry stove to replace our cast iron wood heater.

Masonry stoves are based on ancient
technology
and are amazingly efficient.

The gist of how it works is that the firebox is located in a large, empty space called a thermal mass. The thermal mass retains and radiates heat long after the fire goes out. 

Last winter, we used it and loved how long it kept the house warm between fires. The downside is that it tends to be a bit smokey with a cold start. Until the mass warms up enough to create a good draft, smoke comes out every time the door is opened, or through any leaks in the masonry. There are tricks for dealing with this (Tests and Tweaks), and usually, people only have trouble at the beginning of the season. For us, however, in our goofy southern climate, there are times when we don’t need the stove and let it go out. In a typical winter here, we might restart the stove several times, especially in spring. 

Last month, Dan added a smoke by-pass to use when the stove is started up. The by-pass offers a direct outlet for the smoke created when starting a fire. Once the stove heats up and the draft is good, the by-pass damper is closed and the thermal mass can build up heat. 

Here’s what Dan did in pictures.

The first step was to take down the existing chimney pipe. He
cleans the chimney once a year anyway, so that got done too.

Installing the damper required drilling a 6-inch hole in the top of the
 stove. For that, we had to get a 6-inch diamond masonry drill bit.

The damper had to be modified to be a by-pass. This is because a typical damper plate has openings in it. We needed to seal these so that there would be no heat leaks when the damper was closed. To block the openings, Dan added a disc of ceramic fiber blanket
Here it is from the damper side, where you can see the openings
and gap. You can also see how the insulation discs blocks them.

Insulation side

To close off the damper when not in use, the disc of ceramic blanket had to be cut larger than the damper plate. But Dan was concerned that the soft, pliable fabric wouldn’t stay flat. He thought about it for awhile, and then settled on holding it in place with a round table saw blade.

 

Here it is, reassembled with the new smoke by-pass in place.

It’s still too warm to try it out, but Dan has a couple more improvements to work on, so I’ll show you those as he finishes them. 


Source: https://www.5acresandadream.com/2025/09/masonry-stove-improvements-smoke-by-pass.html



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