I have a 55 TRPEP or maybe better known as a 25 EP. I get a "sooty" window after a few hours burn. It is more prevelent on the left side facing the unit. After time much, not all changes to a greyish white. My fluepipe has a lining of black sooty material. I feel my flame may be a little lazy and large. Bouncing off the backplate and getting me a little nervous about the temp inside the hopper actually. OAK is installed. Removing screen has no noticeable effect. Lower settings are factory set at 141. I just raised it to 151. Haven't run it at those settings yet, mild day here today. I have read varying accounts that the middle combustion air setting only works at 1-2 setting. I usually run at 3-6 heat range. Sometimes at a 2 heat range. I do believe I have gasket problems on hopper and ash pan. I would think even if there was a problem there it wouldn't effect combustion air volume. I assume it might be pulling some from room also and not just from the outside. This is a new stove. I have run maybe 8 bags of "Freedom Fuel" pellets. I clean the stove daily. I seem to have a lot left in the burnpot but I have always thought that was from the shutdown process and not buildup from the day. I pulled the two lower plates and only had a very small buildup of greyish white ash there. Draft is 3" with 3 feet horizontal and 3 feet vertical with cap.
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![[Hearth.com] 25 EP and its magic numbers. [Hearth.com] 25 EP and its magic numbers.](https://www.hearth.com/talk/data/attachments/146/146479-e51fced41f1f71935cad28a7742415d1.jpg?hash=qddJOEziZ5)
![[Hearth.com] 25 EP and its magic numbers. [Hearth.com] 25 EP and its magic numbers.](https://www.hearth.com/talk/data/attachments/146/146480-15863de455f8c09545abf0e08fbbd86d.jpg?hash=teghcix3mc)
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