When we did the install of my new stove recently, we used the stove's manual to determine the distance from the wall to the stovepipe. The manual shows clearly 14" from wall to stovepipe. Realizing now that 18" must be used as a safe,legal minimum distance, I need to make this right. My first option is an approved heat shield mounted on the pipe, but I've never seen one and not sure where to go. Second option is double wall pipe, which is pricey. Third option, I have access to sheet 316 stainless through my work, and could mount this with the proper air gap, non-conductive supports etc. Probably look sharp too. Is uni-strut that is used for running conduit approved as a non-combustable mounting material? If not ,what is? I've enjoyed this forum since finding it about a month ago.