pellet stove vent through insulation?

[rbooe05]

Hey guys, picked up a pellet stove to help heat my new 40x60 building and im having trouble figuring out how to vent it through the wall. I have 6" vinyl faced batts on the wall and im not sure how hot the pipe gets and if i would need a thimble or can i just go with double walled pipe? Trouble is a thimble is way to big to fit between the ribs of the metal siding and i dont think ill ever get it to seal up but i dont want to melt and or catch my insulation on fire! Anyone ever run into this? My plan was to come out of the stove with a T then up the wall 5 ft to an elbow then out the building with a 3ft piece and put a rain cap on it. Thanks for any advice!!

 

[Kaizen]

Yes you definitely need a thimble. Come out of the stove straight to outside. The t goes outside so you can clean straight up to the top


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[rbooe05]

Well shoot. Guess I could always use the thimble but secure the outside face to the inside of the metal. Sandwiching the insulation but only having a clean 3inch hole to the exterior that I can seal. That way I have the air gap between the insulation but a smaller hole between ribs for a nice clean look!

 

[rbooe05]

or i could always just use half the wall thimble and mount to the inside of the metal so that there is an air gap around the pipe and keeps the insulation off of it? Anyone have any photos or ideas on how they have done something similar? Thanks a ton!

 

[Kaizen]

Why not just snip the outside of the thimble so it mates to the metal siding? I always try to retain fire related equipment in original form. I never want to be the guy standing among the ashes kicking himself for a mistake


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[rbooe05]

Very true! I should have the thimble Monday so I'll take a look and see if it will fit at all

 

[Bretny]

Dont forget to hook up your make up air tube too. With out it you drastically reduce the stoves efficiency.

 

[Highbeam]

Dont forget to hook up your make up air tube too. With out it you drastically reduce the stoves efficiency.

Meh. You might think so but it really is only a very slight reduction.

 

[Kaizen]

Meh. You might think so but it really is only a very slight reduction.

Really? Its using all the heated air. How can it not be?


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[Bretny]

I noticed about a 30 percent reduction in wood use on my wood stove. I also gained a warmer house. Thats with a non forced exhaust stove. Most pellet stoves have forced exhaust. So from the moment you turn it on to the moment it turns off your sucking cold air into your house just to blow it out the chimney.

 

[machsnell]

I cut slit in my siding outside to have thimble sit level. Then caulk to seal. You want the peace of mind

I also put roxul immediately outside my thimble inside wall for added sense of security.

Man I love my pellet stove.

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[Highbeam]

Really? Its using all the heated air. How can it not be?


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It just isn't that important for efficiency. Low CFM is the biggest reason.

I like outside air connections and use one for my woodstove but the reality is that they just don't move enough air to matter from an efficiency standpoint. Now the outside air connections do improve comfort mostly due to draft reduction and humidity plus in the shop you can make a safety argument for an outside air connection.

Just don't think you're doing it to save fuel. Minor savings at best.

Go ahead and unhook it some day and see that you use the same amount of fuel.

 

[checkthisout]

Use an oscillating tool to cut slots in the raised ribs of the siding so the edges of the thimble sit flush.