Question for Harman P61 Install in New Construction

[3galbraith3]

I have spent the last few weeks researching pellet stove installs and requirements. I have learned a lot but there are still a few things that are unclear to me so I thought I could maybe get some clarification here.

Here's my situation. We are currently building a house and are just now in the framing stage. When we designed the house we unfortunately picked the location of the pellet stove to not be close to any exterior walls. The stove location will be in the basement, about 10 feet from the closest exterior wall. I picked up an old Harman p61 (old, like from 2000) on fb marketplace. Not sure how it works yet but I am pretty confident I can update it and fix it up as needed.

The original plan was always to run the vent pipe up through the fake framed out fire place/chimney on the main floor where there will just be an electric insert. Then up through the attic and to the roof.

The things that are still unclear to be are the following:

- The run to the roof would be roughly 40 ft I believe. Will that be an issue with getting enough draft? Planning to use 4" duravent pipe based on Harmans manual.
- Should I do a fresh air intake? As far as I can tell from Harmans manual the max run for this is 5 feet? Could I do a run to the exterior wall that would have two 90s and be about 18 feet total going up the wall then out to the exterior wall? Would use 3 inch pipe for this.
- When going through the attic it looks like the duravent setback requirement is 1 inch from insulation but Harmans is 3 inches. Which one would be required? Figured just doing 3 avoids any issues coming up in an inspection.

Thanks for any advice.

 

[johneh]

That is a long chimney and will have at least 3- 90 ° turns. Check the manual may be too much
Yes, install an OAK. New houses are built tightly nowadays, and your stove will burn better with one

 

[3galbraith3]

That is a long chimney and will have at least 3- 90 ° turns. Check the manual may be too much
Yes, install an OAK. New houses are built tightly nowadays, and your stove will burn better with one

Thanks for the reply. Just curious what you mean by having at least 3- 90 turns? I am pretty sure I can get away with just 1 being the clean out T at the stove and should have a clear shot to go straight up to the roof assuming once the trusses are set that it doesnt line up with in the 1 inch setback. Looking at the plans it shouldn't be an issue.

 

[johneh]

The way I read it, you were going up to the ceiling, turning 90, then across the ceiling, turning 90 and out through the roof. Most manufacturers recommend no more than 30 to 35 ft. using a 4-inch vent pipe
That OAK is a very long run for a 3inch pipe may affect the burn characteristics in your stove ( lack of combustion air)