Does anyone have the holes at the back side of your hopper? I'm assumeing they are to let any build-up of gasses escape up the chimney, am I correct? I'm wondering if the holes would cause any turbulance in chimney draft. Maybe they are put in to CREATE turbulance, I don't know. Any comments? My 30-95 doesn't have holes in the back of the hopper. Seems to me that the holes might also let the fire go up into the hopper. Or, does the chimney draft overcome any draft from hopper holes. HITZER done away with the hopper gasket, and added holes. What's up with the hopper holes? Anyone??? Are these holes in all the gravity fed hopper models?