This is a basement intall. The fresh air intake ductwork is 3" hard round galvanized and is behind the drywall (with faux rock veneer). There is approx. 4 inch stub-out of exposed 3" duct prodruding out of the wall, which is provided for attaching the stove's 2" semi rigid aluminum fresh air intake hose. How the heck do I attach 2" aluminum "flex" duct to the 3" rigid duct? My extensive search finds no 3" to 2" duct reducing fitting available on the market. Any ideas greatly appreciated.
Fresh air intake duct size........... A problem that needs solving.....
- Thread starter sorethumbs
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Washed-Up
Minister of Fire
Maybe I'm on the wrong track but I'll ask because I'm curious even though it doesn't apply to my stove.
Could the rubber reducers with a hose clamp on each end commonly found in plumbing aisles work? Or do you think heat would be an issue at that part of the stove?
Washed-Up
Minister of Fire
I wouldn’t use rubber just because of the possibility and your insurance company would most likely not go for it either
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ABusWrench
Feeling the Heat
I wouldn't use a typical rubber adapter/reducer because the heat would dry it out, possibly cracking. Silicone adapter/reducer should be fine. Silicone hoses are good to 350 degrees, higher quality goes to 500 degrees. I would think they would be fine. Just use the proper hose clamps.
I appreciate the replies from you and Washed Up. As stated it doesn't really apply to my situation, sometimes I just like to get opinions and learn things for my own knowledge.
I know that with my stove, I don't think heat would be an issue. I can easily lay my hand anywhere on back side of the stove when it's burning.
Thanks for the information. I was hoping for something metal, but it's good to know about the silicone fitting. I did take a good look at it. It appears that it is sized OD on both sides. That would work for the 2" side, with the flex duct going over the silicone, but question the use of a hose clamp to secure two flexable pieces together, it dosn't seem like that would work or be a very good idea. The 3" side I don't think would work without an addtional adaptor, it wouldn't go over or inside the 3" duct as is.
It's just a bummer that this fittiing doesn't exist. It's looking more and more like I'll need to fabricate something myself. I wish I would TIG weld.
It's just a bummer that this fittiing doesn't exist. It's looking more and more like I'll need to fabricate something myself. I wish I would TIG weld.
ABusWrench
Feeling the Heat
Like ABusWrench says, a muffler shop may be able to help you. They have machines that expand the ends of exhaust pipe to make it so one pipe can slide into the other.
ABusWrench
Feeling the Heat
Washed-Up
Minister of Fire
There’s a few options, keep us posted
Vibrant 12054 3" O.D. Aluminum Joiner Coupling
Amazon product ASIN B001P28QLM
Vibrant 12054 3" O.D. Aluminum Joiner Coupling
Amazon product ASIN B001P28QLM
Update: this fitting didn't work. The 2" ID was to big. The 3" OD side was great and slipped inside the 3" duct perfectly. However I was able to scour Amazon and finally found the same fitting with 2" OD x 3" OD and that was the ticket. I could only find one seller who offered this size fitting and it was aroung 25 bucks, but it works. Thanks for the help.
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