Distance from wall for Pionerr Back Vent

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.
Thanks.

i have a pioneer back vent hook to a power vent. the power vent is approx. 1foot from the corner. i connected the baro damper directly to the stove installed a 45* on the baro and connected directly to the power venter. with this type of install it leaves about 1' of clearance from the rear corner of the stove not the hopper to the adjacent wall. from that point back towards the corner the walls very cool to the touch. the seperation distance increases from that point foward. seems to work great this way no problems since October. the flue pipe never gets hotter than 140* with pv.

my hearth is 5'-0" along the wall in both directions 2'-0" perpendicular to the wall and then connect to the other side with a 45* angle.