Hello, A dealer will be installing a Quadrafire natural gas freestanding stove that will be directly vented through the wall. Unfortunately, the spot where the vent pipe is going contains wires. I am going to move the wires out of the way as much as I can. The owners manual says that there must be a 10" x 10" square hole in the wall to accomodate the wall thimble. My question is: how far must electrical wires (inside the wall cavity) be from the wall thimble? I did not see reference to this in the installation manual. Thank you for your help!