It is a restriction that slows the velocity of the rising gasses. Your flue damper inside is to slow an over drafting chimney. Get a good one and any stove will work much better. It is more important than the stove itself. So the chimney becomes the engine that drives the stove. The greater the temperature differential, the stronger the draft and the more you can close the air, burning slower with less waste up the chimney. The rising gasses create a low pressure area in pipe and stove that allows the higher atmospheric air pressure to PUSH into the stove. Single wall pipe cools the rising flue gasses, they slow down or stop, and does not create the low pressure in the pipe and stove needed to make the stove burn inside. As you learned, a stove won't work without a temperature differential between the inside and outside of chimney. Below that critical temperature, water vapor from combustion condenses on flue walls allowing smoke particles to stick.

The reason you want it to stay hot inside, and not cool like your single wall pipe does now is the object is to keep the inner flue gas temp above 250*f to the top. The easier you can keep the flue hot, the less fuel you need to burn to allow the waste heat to heat the chimney. The double wall stays hotter inside for a more efficient chimney. The double wall type is smaller outer diameter since it is only 1 inch thick ( 6 inch inside is 8 outside) compared to the triple wall with 1 inch between each of the pipes making it 10 inch diameter outside. An exterior chimney cools more since more is exposed outside even though it has an inner insulated stainless flue pipe.Ĭhimneys are stainless inside to prevent rust from the moisture created from combustion.Ģ types of prefab chimney are a cheaper triple wall with a thin insulation blanket around inner flue pipe, or a 'pack' chimney which is an inner flue with dense heavy insulation between thinner and outer pipe casing. They also draft better straight up and you won't have to possibly notch the roof overhang for an exterior chimney. A 'Through the roof' kit is much cheaper and the connector pipe inside goes into a ceiling support box which starts the chimney. The single wall pipe connects inside to the chimney pipe at the wall connection.

Then you buy as many chimney sections as you need. You need a 'Through the wall' kit which will have the wall thimble where it passes through wall, an outside tee with support for chimney weight, and cap for cleaning at the bottom along with spark csreen on cap at top. The connector pipe inside is ok as long as the horizontal run is pitched upward towards the chimney by at least 1/4 inch per foot.

Hutch rebel wood stove parts