I recently purchased a Pleasant Hearth PH1800WS. I am trying to get closer to my drywall wall with the stove. I can not find any type of clearances when used with a heat shield. I have tried to call Pleasant Hearth and am on hold forever. If I can't find closer clearances using a heat shield does this mean that I can't get closer using a heat? Along with that what size heat shield is required? I have read 8" wider on the sides and 20" taller than the height of the stove, while other sources state that you have to measure 36" from the top and sides going out at an angle. Which one is correct? Seems if I use the latter suggestion I am covering 3/4 of my wall height up, for a 8' tall wall.