can I use a stove designed for a 8" flue with a 6" flue?

[ahd124]

This is probably addressed elsewhere in the forum, but does anyone
know if I can use a 1980's vermont castings defiant with a 6" flue? I
currently have a jotul black bear, but it doesn't burn long enough for
me. I have a friend who wants to trade me for their defiant, but I
don't know if it will draw properly. There would be 2 45degree turns,
but the chimney is newly relined, 30' tall, and insulated. Any
thoughts would be appreciated.

 

[HalJason]

This is probably addressed elsewhere in the forum, but does anyone
know if I can use a 1980's vermont castings defiant with a 6" flue? I
currently have a jotul black bear, but it doesn't burn long enough for
me. I have a friend who wants to trade me for their defiant, but I
don't know if it will draw properly. There would be 2 45degree turns,
but the chimney is newly relined, 30' tall, and insulated. Any
thoughts would be appreciated.

Pretty sure that's a no-no. I _believe_ that you can use a stove designed for a 6", with an 8", provided theres enough draft, but not vice-versa. Someone will correct me if I'm wrong.

-Hal

 

[Gooserider]

Depends on the stove, the answer should be in the stove manual. Some stoves you can do it but only with restrictions. For instance some of the VC stoves had the ability to be run with the front doors open, using a fire-screen. This wasn't allowed if using a 6" flue instead of an 8".

There are relatively few stoves that can't be used on a 6" flue, but I'm not sure about this model

Gooserider

 

[Roospike]

I've seen Earth Stoves run on a 6" that are made for an 8" pipe. @ 18' chimney and two 45° these stove were running at about 80% of what they could of.

 

[elkimmeg]

I have the pre 1988 Vermont castings manual here and it states that the Defiant and Viligant flew collars must not be reduced they require an 8" connector pipe and flue.

In the 90's the Encore was tested and certified for use with the optional 6" flue collar. However the open fire screen option is not supported

 

[Corie]

Yeah elk is absolutely right. I have the same manual in front of me here. Its the reason the donor stove is getting an eight inch flue all the way up.

 

[MountainStoveGuy]

today, i had a customer come in looking for advice. He didnt buy a product that i carry so i was not familar with his insert. He has a 6" liner and a 8" flue outlet, on a country insert. The manual stated that it could run on both flue sizes. I must be ingnorant, is this a new trend? I have seen plenty of manuals that say a 6" stove will work on a 8" pipe, but not vise versa. He was concerned, and in my mind, rightfully so.