I am trying to prepare a hearth pad for a corner installation of a pioneer back vent stove. The clearances in the online manual don't give any specs for a corner installation. Is the distance from the wall to the back corner for the stove or the hopper? How much pipe distance from the back of the stove the wall will I need? Is there a minimum distance from the parallel wall to the vent pipe coming out the back? Any guidance would be helpful. I've tried to reach my dealer but he is unavailable.