New Lopi/Travis Industries Nexgen Large Flush Wood Insert install using Millpac sealant

  • Active since 1995, Hearth.com is THE place on the internet for free information and advice about wood stoves, pellet stoves and other energy saving equipment.

    We strive to provide opinions, articles, discussions and history related to Hearth Products and in a more general sense, energy issues.

    We promote the EFFICIENT, RESPONSIBLE, CLEAN and SAFE use of all fuels, whether renewable or fossil.

TrailOre

New Member
Feb 23, 2021
10
Southern Oregon, U.S.A.
Greetings from a newby. I'm a new owner of the Large Flush Wood Insert (Nexgen) from Travis Industries/Lopi. We have about 60 - 70 hours burn time on it so far, it was installed about a month ago using a new insulated liner inside our existing masonry chimney. Our installer used Millpac sealant and we're still getting a nasty "burned grease" smell during and even long after we burn. For instance, our last burn was five days ago and this morning's cold air, I believe, is moving down the chimney and forcing the stink through the small gap between the shroud and the wall. This smell is beyond unpleasant. From what I've read Millpac is meant to cure with heat. Well, we've had some hot burns (500-600F) and I'm wondering if the stink will ever go away. Does anyone have any advice on how to get rid of the smell? Is it just a matter of continuing to burn and eventually (some day) it will go away? At this point the wife and I are second guessing whether or not it was a good idea to have made this purchase. Thank you in advance for any comments/advice.
 

bholler

Chimney sweep
Staff member
Jan 14, 2014
25,670
central pa
Greetings from a newby. I'm a new owner of the Large Flush Wood Insert (Nexgen) from Travis Industries/Lopi. We have about 60 - 70 hours burn time on it so far, it was installed about a month ago using a new insulated liner inside our existing masonry chimney. Our installer used Millpac sealant and we're still getting a nasty "burned grease" smell during and even long after we burn. For instance, our last burn was five days ago and this morning's cold air, I believe, is moving down the chimney and forcing the stink through the small gap between the shroud and the wall. This smell is beyond unpleasant. From what I've read Millpac is meant to cure with heat. Well, we've had some hot burns (500-600F) and I'm wondering if the stink will ever go away. Does anyone have any advice on how to get rid of the smell? Is it just a matter of continuing to burn and eventually (some day) it will go away? At this point the wife and I are second guessing whether or not it was a good idea to have made this purchase. Thank you in advance for any comments/advice.
Millpac never really cures but i have never had it put off a smell either. Was the chimney properly cleaned ahead of time
 

moresnow

Minister of Fire
Jan 13, 2015
1,796
Iowa

begreen

Mooderator
Staff member
Nov 18, 2005
89,794
South Puget Sound, WA
Where was the Millpac used? Hopefully not at the flue collar.
 

begreen

Mooderator
Staff member
Nov 18, 2005
89,794
South Puget Sound, WA
It is rated at 1050º, but it may outgas at lower temps. It shouldn't be needed at the flue collar which is the hottest point exiting the stove. If there is a large gap, then gasket rope should have been used.
 

TrailOre

New Member
Feb 23, 2021
10
Southern Oregon, U.S.A.
It is rated at 1050º, but it may outgas at lower temps. It shouldn't be needed at the flue collar which is the hottest point exiting the stove. If there is a large gap, then gasket rope should have been used.
Hmm... ok, good to know, thank you. At this point, though, I'm having to figure out what to do from here. Do you (or does anyone) have an idea on how to stop it from off-gassing? Will time or maybe repeated burns tame this beast?
 

begreen

Mooderator
Staff member
Nov 18, 2005
89,794
South Puget Sound, WA
First try to pinpoint the source. Remove the surround and sniff the flue collar area, using a section of hose if necessary. See if you can pinpoint the odor. Scrape off some of the Millpac around the flue collar and smell it. If that is the odor, then remove as much as possible.
 

TrailOre

New Member
Feb 23, 2021
10
Southern Oregon, U.S.A.
First try to pinpoint the source. Remove the surround and sniff the flue collar area, using a section of hose if necessary. See if you can pinpoint the odor. Scrape off some of the Millpac around the flue collar and smell it. If that is the odor, then remove as much as possible.
Thanks for the advice: I’ve removed the face but I’m having a devil of a time removing the surround. It looks like there are two tabs on either side of the surround that slide in and out of the insert but I can’t get the surround to move up, out, or in any direction. Does anyone know: Is there a trick to removal, or am I missing something?
 

begreen

Mooderator
Staff member
Nov 18, 2005
89,794
South Puget Sound, WA
Not sure on this insert. Does the air control need to be unscrewed first?
 

PaulOinMA

Minister of Fire
Oct 20, 2018
1,035
MA
Can you check the owner's manual it see if it has how the surround is attached? It's on the Lopi website, if you don't have it.
 

TrailOre

New Member
Feb 23, 2021
10
Southern Oregon, U.S.A.
Can you check the owner's manual it see if it has how the surround is attached? It's on the Lopi website, if you don't have it.

Yes, I found it. Thank you.
lopi 2.jpg
 

TrailOre

New Member
Feb 23, 2021
10
Southern Oregon, U.S.A.
The installer tilted the insert forward so that the surround would fit more closely to the wall. Maybe because the insert is now tilted the surround will not simply lift up and out. That said, I see the owners manual clearly says to seal the flue with fireplace cement. In fact it says to use "generous" amounts at every joint. So...at this point I'm hesitant to try to remove the Millpac sealant if the manufacturer says it is supposed to be there. It's a bit of a quandary for me now. This Millpac continues to fill the room with stink long after the fire is out: not nice. I'm not sure what to do at this point. Does anyone have experience with Millpac: does it just stink forever?
 

PaulOinMA

Minister of Fire
Oct 20, 2018
1,035
MA
You're welcome. Thought it attached like on my little Answer. Easy to get on and off for me.