3 inch or 4 inch venting for my P43

You know what they say....... Bigger is better. With that span I would do 4"

If I were to do it again, I'd get the 4". If you ever get lazy about cleaning your vent pipe, the 4" will cut you more slack, before affecting your combustion. Only 1" larger but 78% more volume. I'd wager you might be able to go a whole season before cleaning without noticing any change in your flame. I wouldn't, but I bet you might be able to do it.

Hello

Selkirk DT is my cup of tea! 4" diameter with heated oak! Makes a Harman in to a Super Stove!

glange1969 said:

I just ordered my new Harman P43 , was wondering if I would be
better off with 3 or 4 inch venting pipe ?
I will be going thru the ceiling of my family room , about 15 ft. of total pipe.
Any opinions would be appreciated.

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4 inch, you have some piece of horizontal run off the stove and a 90 or a T depending on how you do it. I'd go 4" all the way then you have no concerns about draft being restricted..You're only a couple of ft away from the limit for 3" anyway.

glange1969 said:

Thanks for the input everyone, I'm going to go with a T and run 4 inch all the way up....

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You won't regret it, then if you build a 1/4" of junk on the walls of the vent you won't be down to 2-1/2 vent before you can clean it. Build a 1/4 inch of crud on the 4 inch you are still a half inch over minimum specification.

glange1969 said:

Thanks for the input everyone, I'm going to go with a T and run 4 inch all the way up....

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What about and OAK? Outside Air Kit?

If your in doubt about the performance then go to four inch. Adjust the intake damper accordingly to the rise you have to prevent creosote from forming, you may need to close it some depending on the stove. As far as outside air goes, try it without first and watch the burn. If you have a newer super air tight house then you may need it if not, then not. Its easier putting it after the fact then putting a hole in the wall that you didn't need.

4 inch and I own p43 good luck and enjoy !