Looking for info from anyone with a basement installation. I have installed my USSC 6041PT pellet stove with the adapter pipe on the exhaust with a cleanout tee. there is a 24 in vertical pipe into a 90 and thru the foundation with approx 24 in horizontal to a 90 and a 12" vertical then capped. :roll: I installed the OAK and used 2" flex pipe (from advance auto) I know the length of the flex pipe is a factor( which is approx 5 ft from the stove thru the foundation) but i'm not getting any outside air. The stove is running "OK" but i am not getting the "Vibrant Flame" that i was expecting. Could it be the OAK or the lenght of the exhaust up and out thru the foundation or both. This is 3" pipe. Burning New England and Instant heat Pellets. Settings HR=3 DF=6.