Hi new to the forum and was wondering if any one could help with a problem I am having with installing my usstove model 6500 pellet furnace. I have a 6" hole in my basement wall 5 1/2' above my basement floor. I wanted to run a 90 cleanout then 4' of pipe out through a wall thimble to the outside. The problem I have is my ground level is 5 1/2' so I dont have the required 18" of ground clearance and the manual says I can only have a total of 180 in the install which I have getting the pipe to the outside. Any Ideas of how I can get another 18" of clearance? Would the furnace not get enough draft if I used 2 45 outside the house to get the extra height off the ground? Any suggestions would be appreciated!