Can i install a thimble through a header board? I plan to install a pellet stove in front of my sliding glass doors. The glass section that is closest to the wall is useless space in our kitchen and I would like to do a corner install. My only option to vent is above the door but there's a header board there. My only other option is to go through wall into bathroom and make a few 90 degree turns until i punch through to the exterior.