Hi, I've been reading and learning a great deal here for a while but now I have a question. I'm in the process of building a hearth to intall a Regency F1100. The hearth is being built with cement board, stone veneer, bluestone slab, correct stove clearances...........but I would like to have a small mantle behind the stove. I have a log that's been cut in half for a rustic look to use for the mantle. If the mantle is placed well above the stove, around the 4 foot height, and within the clearances of the double wall stove pipe, is this allowable?