How to seal a fireplace flue

How to seal a fireplace flue

PostBy: Greyhound On: Fri Oct 26, 2007 10:00 pm

I am now considering putting a stove in front of an existing fireplace and running the pipe into the fireplace chimney. My question is how to best "seal" the bottom of the existing flue vs. having to fill the whole chimney with stove pipe. When I asked Alaska how they would install their Kast Console as an example they suggested that they would use a flexible stainless steel pipe of an ovoid shape and force that past the existing flue damper and stuff fiberglass in around it to seal it.

Thoughts or ideas?

Thanks in advance!
Greyhound
 
Hot Air Coal Stoker Stove: Keystoker 105
Coal Size/Type: Rice
Other Heating: Lenox Oil HA, Heat Pump

PostBy: Jerry & Karen On: Fri Oct 26, 2007 10:07 pm

I think Alaska gave you the best answer. Just make sure you go at least 2' above your fireplace damper with your flex pipe.
Jerry
Jerry & Karen
 

PostBy: jeromemsn On: Fri Oct 26, 2007 11:03 pm

Hello, Thats what I did with the harman elite I put in and it seems to work great. 0 reading on c/o meter and no smoke or smell. I removed the damper door and pushed the oval ss flex tube up 5 ft. stuffed it good with insulation and also put insulation around surround. My very first burn was the other night and it went without a hitch and the burn lasted from 6pm to about 8am with the fire box about half full. What a great way to heat your home! I'm new at this and read everything here before I did the install.
jeromemsn
 
Hot Air Coal Stoker Furnace: Keystoker 90 dvc
Hand Fed Coal Stove: Harman elite fireplace insert


PostBy: coaledsweat On: Sat Oct 27, 2007 8:30 am

I have a 6" S/S adapter around here some place that I used when I had a woodstove in the fireplace, it is oval too. I think the tube that went up the chimney is about 4' long. It has a flat panel that fits where the damper went and then was sealed in with glass insulation. If I can find it I'll let it go for $75, I think I paid $230 for it new and used it 2 years.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re:

PostBy: mikew On: Tue Jan 29, 2008 12:34 am

jeromemsn wrote:Hello, Thats what I did with the harman elite I put in and it seems to work great. 0 reading on c/o meter and no smoke or smell. I removed the damper door and pushed the oval ss flex tube up 5 ft. stuffed it good with insulation and also put insulation around surround. My very first burn was the other night and it went without a hitch and the burn lasted from 6pm to about 8am with the fire box about half full. What a great way to heat your home! I'm new at this and read everything here before I did the install.


you don't say wether you you used a plate to cover the damper opening, did you just run the pipe up and stuff regular unfaced insulation around it?
mikew
 

Re: How to seal a fireplace flue

PostBy: jeromemsn On: Tue Jan 29, 2008 2:06 am

Just stuffed the insulation tight all around the oval pipe works great, and don't forget to put some strips of insulation around the surround also.
jeromemsn
 
Hot Air Coal Stoker Furnace: Keystoker 90 dvc
Hand Fed Coal Stove: Harman elite fireplace insert

Re: How to seal a fireplace flue

PostBy: coalkirk On: Tue Jan 29, 2008 7:34 am

That setup will work but it makes it impossible to do any mid season fly ash removal from the pipe unless you can put a"T" in the bottom with a removal cap.
coalkirk
 
Stoker Coal Boiler: Harman VF3000
Coal Size/Type: antrhcite/rice coal

Re: How to seal a fireplace flue

PostBy: acesover On: Tue Jan 29, 2008 8:41 am

If you dont go all the way up the chimney with flex-tub, one WORD, flyash. think about it.
acesover
 
Stove/Furnace Make: Baker
Stove/Furnace Model: insert, modified