Put it this way... I would do it in my own house but would be wary of putting it in a customers house, only due to the code reasons and associated liability. I'm hesitant to tell somebody "yeah, go head and due it" when a code official could easily choose to fail it. Once again, common sense would say no problem, but codes officials must go, literarilly, by the book. (Not saying codes officials have no common sense, only that they are limited in their power to approve something that is not listed.) On the common sense side -- Alot of the pellet inserts are acceptable to be used as zero clearance units (built into framing). The hoppers are always in the fireplace so, obviously, not much heat there either. As Craig said, bricks or some other noncombustable material can support the front of the unit.