Ok I have finally got this insert close to ready running 6 feet of stainless rigid pipe up to the first flue tile. The problem is that the pipe is tilted back about an inch and goes into the flue collar on the top of the insert about 2" on the back and1" on the front which has a hole and now a screw to keep the 2 connected however I can see some of the perforation on the pipe in the front. Will this be ok ? If so I could just seal all around the collar and pipe with furnace cement. It is soo close!! I do want things to be safe though and if this doesnt work not sure how to make up the diffence in the tiled pipe as I cant move it any more than it is... HELP!! I have been looking at this insert sitting there for 4 months and just want to take the tags off and burn it!