I have a Santa Fe Insert on order and the dealer is refusing to install an OAK in masonry chimney. The manual has a picture showing it installed, an it looks reasonably simple to me. The only tricky part could be the chimney cover needs to have another hole for the air pipe. I insist on having an OAK but don't know where to turn now? Does anyone have a Quad insert in a brick chimney and an OAK? Was it a near impossible task to accomplish?