By Joe from Milwaukee on February 10, 2013
What is the reason for the 6 inch piece? None of FMI's venting directions call for a 6 inch vertical rise.
By Tyler M. - Fireplace Specialist on February 11, 2013
Answer:This is a vent kit for a corner installation. The 6" pipe length is provided in the event that the 7"- 12" adjustable pipe length is not enough to get to the outside of the exterior wall for termination.
By Brian Schauer from East Troy, Wisconsin on August 2, 2012
I am putting my fireplace in the basement with a horizontal exhaust but my sill plate is not large enough to cut a 11.5x11.5 inch hole for the firestop. I have about 10.5 wide and 11 inches tall. Do you have any suggestions?
By Collin C. - NFI Master Hearth Professional on August 2, 2012
Answer:Unfortunately, this is an issue that commonly occurs and there seems to be no good way around it. The clearances for the pipe must be met and in order to do so, you will need to use an air hammer to remove some of the outer wall material, below the sill plate.
As far as the width of the opening goes, you will need to box the adjacent floor joists, then cut and move the ends of one of the joists to gain the extra width that is needed.