Oval to round flue

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George D
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Post by George D » Wed. Dec. 01, 2021 9:28 am

I realize this topic was covered several times already...I did search here and elsewhere, but I still have a few questions. My flue outlet is 6 1/8" long by 3 1/2" wide. The six inch pipe is 7 7/8" when compressed into an oval.

It seems like too much space on either side of the pipe, and I'm thinking it won't draft properly as well as a possible fire hazard.

I scoured online, but could not find any suitable adapters. If anyone has any ideas please let me know. I attached some photos.
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Sunny Boy
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Post by Sunny Boy » Wed. Dec. 01, 2021 9:37 am

Yes, that much pipe gap will cause draft problems.

Two possible fixes.
1. Have a sheet metal shop make a tapered 6 inch pipe to fit the stove collar.
2. Pack the gaps around the collar tight with fiberglass insulation. Only put screws to secure the pipe where the pipe contacts the collar, so as not to distort the pipe shape and cause air leaks.

Paul

 
George D
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Post by George D » Thu. Dec. 02, 2021 12:39 pm

Thanks for the reply, Sunny. I did think about stuffing insulation around the pipe, but wasn't really sold on the idea. Before I had something custom made, I made an attempt to make it myself.

The original adapter had an 8" oval...I drilled out the rivets, reshaped it, and installed new rivets. Much better than before.
.

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Hoytman
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Post by Hoytman » Thu. Dec. 02, 2021 2:59 pm

Bingo! Nice work!!!


 
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Lightning
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Post by Lightning » Thu. Dec. 02, 2021 3:13 pm

Easy fix, nice work!

 
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Sunny Boy
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Post by Sunny Boy » Thu. Dec. 02, 2021 4:38 pm

George D wrote:
Thu. Dec. 02, 2021 12:39 pm
Thanks for the reply, Sunny. I did think about stuffing insulation around the pipe, but wasn't really sold on the idea. Before I had something custom made, I made an attempt to make it myself.

The original adapter had an 8" oval...I drilled out the rivets, reshaped it, and installed new rivets. Much better than before.
.
Nice job. That's what I did with my kitchen range. I was going to suggest that, but few have the tools and know-how to do that.

Bryant Stove shop in Maine used to sell tapered pipes for antique stoves. But they were too long for my range and be able to put the MPD down low enough for the wife to reach without leaning over a hot stove. So, I made a shorter tapered pipe out of some sheet stainless steel I had. Then rivet it and smear some Hercules stove sealer into the seam in between rivets to make a leak-proof seal.

Paul

 
D.lapan
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Post by D.lapan » Sun. Dec. 12, 2021 3:51 pm

For future reference me, Lapans Antique stoves and Brandon at the Antique Stove Hospital both have the turn of the century tooling to make all sizes oval and round up to 30" long for Antique stoves, some antiques had odd size collars for example some Crawfords have a 6.25" flue collar. You can find a 7-6 oval to round online but they are 28g and riveted together Brandon and I both make ours from 24g and are crimped and spot welded.
Dana

 
George D
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Post by George D » Mon. Dec. 13, 2021 8:34 am

Dana, thank you for the links. I never came across these two shops when I was trying to find parts. They seem to be a good resource for many parts folks here are always looking for. The custom stove pipes are a major home run...many have a tough time finding the right adapter for their stove...its nice to see someone still makes them.

I'm going to reach out to them about a replacement shaker grate and an ash pan for another stove I intend on purchasing.


 
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Post by GeoSteven » Thu. Dec. 23, 2021 9:55 am

I ran into the same problem on the unknown name brooder I picked up yesterday. I ran a piece of string around the oval flue opening and measured that at 15 3/4". Using that as the circumference I determined (C/pi) that 5" stove pipe should work much better. Called to local hardware store and found a stick of that. Gonna pick it up and give it a try. I'll update when done.

 
George D
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Post by George D » Thu. Dec. 23, 2021 10:49 am

Good luck with that. If you still have trouble, check out the post above by D.Lapan, he sent me two links for places that will make the pipe for you.

 
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GeoSteven
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Post by GeoSteven » Fri. Dec. 24, 2021 12:38 am

I got the 5” pipe today and it fit nearly perfectly. 😎👍🏼

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George D
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Post by George D » Fri. Dec. 24, 2021 1:46 am

Very nice! Wish mine was that easy.

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