I finally got my ceramic blanket and fiber board in and should have everything now to get the quadrafire 7100 set in place.I forgot to ask the guy at the fireplace store about my flue and he is 50 miles from here. The first pic is of my flue system I am using. Its the double wall air cooled flue.Next two pics are of my new addition ceiling.The roofers put the part on the roof the flue goes through so all I have to do is cut the hole. What do I need to do or buy for where the flue goes through the trusses. Its a 3/12 pitch cathedral ceiling. Going to be putting bat insulation in the ceiling.Someone said something about building a chase but not quite sure what they meant. The guy I bought all this from just had flue through his roof but Not sure what he had where it went through the trusses.