I have a Enviro mini pellet stove . OK pull out the ash catch pan there are 2 clean outs one on the left side and one on the right side. just behind the ash pan there is a square opening with 4 bolt holes where a plate would cover. i guess my question is when running the pellet stove should that be plated off or open? i ran it all last year with it open seemed fine but it seemed to pull the flames down and around the fire pot.