Draft sufficiency block-off plate vs full chimney liner

[kiloforty]

I'm debating whether I should connect a Lopi Freedom to a block off plate or spend the money to run a full chimney liner. Do you think draft will be sufficient with the block off plate leading to a clay lined single story house interior chimney?

 

[Pertzbro]

Liner. I think what you're describing is either a slammer install or a full liner install, correct?

Full liner 100% of the time.

 

[kiloforty]

Liner. I think what you're describing is either a slammer install or a full liner install, correct?

Full liner 100% of the time.

Not a slammer install I don't think. Here's a pic the install I'm referring to as an alternative to full liner.

 

[Pertzbro]

Just to be clear, you're asking between Option 1:


Or Option 2:


The best option would be #2 with a blockoff plate installed as well. However, the full liner should most definitely be used as it's safer and will eliminate poor draft and smoke smell. Block off plates are optional and only increase the heating ability of an insert.

 

[moresnow]

I believe you are talking about a direct connect install. Not favorably looked upon in most cases compared to a correct liner. @bholler can truly elaborate.

 

[weatherguy]

It will be a pain to clean, a full liner is easy peasy. Spend the extra dough and do it correctly, you'll be happy in the long run.

 

[bholler]

I am assuming you are referring to a direct connect . Which to be done properly you first need a code compliant chimney. So are all of the clay tiles in good condition with all the mortar joints filled properly? Do you have the required clearances from the outside of the masonry structure?

If you have all of that then your clay liner can be no more than 3x the volume of the stove outlet which most fireplace flues are.

If all that checks out you then need to figure out how to make a positive connection from the stainless liner running from the stove to your clay liners in the chimney.

If you can do all of that you can run a direct connect not a full liner safely. But a full liner will still perform way better.

 

[bholler]

Not a slammer install I don't think. Here's a pic the install I'm referring to as an alternative to full liner.View attachment 236136

Are those instructions for your stove specifically? Regardless I would never install a stove that way. The flue gasses will leave the pipe and expand rapidly causing the to cool and fo creosote. Which will then require pulling the stove and blockoff plate to clean

 

[Pertzbro]

Are those instructions for your stove specifically? Regardless I would never install a stove that way. The flue gasses will leave the pipe and expand rapidly causing the to cool and fo creosote. Which will then require pulling the stove and blockoff plate to clean

Yes thats from the manual.

 

[bholler]

Yes thats from the manual.

That is an adsolutly horrible way to install a stove. Is this a ul listed stove? Because if so I am surprised that made it through the approval process.

 

[begreen]

This should have been posted with or in the other thread for context. He wishes to replace a slammer with a modern EPA insert, interior chimney.

Go for the full liner, no question about it. But be sure the chimney and smoke shelf in the fireplace are completely clean first.

prior thread:
https://www.hearth.com/talk/threads...od-insert-to-epa-lopi-insert-worth-it.172642/

 

[Pertzbro]

That is an adsolutly horrible way to install a stove. Is this a ul listed stove? Because if so I am surprised that made it through the approval process.

It's in most of the Lopi insert manuals. The Hybrid ones w/ a cat require a full liner.

(broken link removed to https://www.lopistoves.com/TravisDocs/100-01259.pdf)

 

[begreen]

It's a legal option, but far from desirable. In the OPs case, with a shorter chimney it could lead to poor stove performance due to insufficient draft.

 

[bholler]

It's in most of the Lopi insert manuals. The Hybrid ones w/ a cat require a full liner.

(broken link removed to https://www.lopistoves.com/TravisDocs/100-01259.pdf)

View attachment 236142

A real direct connect is bad enough but that is just horrible.

 

[begreen]

A real direct connect is bad enough but that is just horrible.

And wisely not allowed in Canada.

 

[bholler]

And wisely not allowed in Canada.

It shouldn't be here