I have an enviro pellet stove EF3. I have the same problem that many of you are having with big clunkers forming in the burn box every day.Lots of ash is accumulating everywhere, requiring daily cleanout. The air intake slider does not appear to be working, in that it makes no difference in the flame whether its in or out. I don't have a magnehelic guage. Do I need the service person to look into this? It was installed with a horizontal exhaust which some of you swear against. Shoud I change this to vertical exhaust? After about 16 hrs. of use, there is a soot smell in the house. This seems unhealthy. How bad is it to breathe in this soot? Its not a large amount, but after a long time, I'm concerned that the effect can build up. I want to save money on heat, but I don't want to get lung disease. I've been setting the blower speed to max to get more heat in the house, but is this adding to the clunker buildup problem? My oil heat furnace recently wasn't working so I needed to get as much heat out of the pellet stove as possible.