Tall Chimney

[blbake1]

I am building a house and have a 2 questions for anyone willing to answer.

1. For the basement wood burning fireplace insert, the flue will be around 40-45 feet tall. Is this too tall? I see that Harman (300i) specifies that flue must be no taller than 33 feet. I don't see that in other manuals. 6 inches seems standard, but could it be 5 inches? I have seen a damper suggested on this board, but how do you use a damper with an insert?

2. Is there any issue with 1 masonry chimney sharing 2 flues, for the basement and main level? I may not actually install an insert on the main level, but I would like to have the option in the future. I thought I might use ventless gas logs there initially, since I already have a set that has never been used.

I am looking at the PE Alderlea T5, Kuma Ashwood, and Hearthstone Clydesdale.

Thanks for your help.

 

[begreen]

That is going to be a long run for sure. Downsizing to 5" liner will help, but the flue gases are going to cool a lot by the time they make it to the top, especially if this is an exterior chimney.

If the masonry chimney has two independent flue in it, one for each floor, that's fine. If the basement and main level have a common flue, that's not ok.