chimney question

[beefalo]

This is for those of you that have a corn or wood pellet furnace.If you had a regular chimney before you installed your corn burner did you have to do anything different to make the furnace work.I have an 8 inch square flue and was told that I'd need to make it a 6 inch to make it work right.what do you people think?

[corn4myheat]

I have a LMF furnace and used it 3 years without anything , other than the 7 in clay liner in the chimney .. No problems
Be sure you use a adjustable damper and a manometer..
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LMF furnace
"I built it with my own two hands"

[beefalo]

do you have a stainless steel liner also in it ?

[Jed77]

I also have a LMF Furnace and run mine in a clay liner. I believe it is like 7" x 12" rectangular flue. Mine has been working fine for over 3 seasons.
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LMF 100k Furnace
*Variable Speed Combustion Fan
*Fresh Air Intake

Mobile Corn Vac

[SidecarFlip]

This is what happens. If you combust just pellets, nothing. If you burn corn, combusting corn gives off some by-products besides carbon dioxide and some particulates, it gives off nitric acid. Nitric acid will eventually erode the mortar joints between the liner sections. Because the clay liner is cold and the appliance exhaust is nowehere near as hot as say a wood furnace would be, you get condensation along with the nitric acid on the inside walls of the clay flue and eventually, the nitric will erode the joints enough to compromise the chimney.

How long does that take, I have no idea, but it is a progressive scenario and that's why all the appliance manufacturers recommend lining a clay flu with stainless venting, whether ridgid or flex.

It's sort of like the saying 'pay me now or pay me later'. The way I see it, a stainless liner is a whole lot cheaper than a new masonry chimney.

That's the primary reason I vented outside instead of utilizing the existing chimney.
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