New member here, hope somebody can answer a question for me. For a bit of background, I have an Englander 30 woodstove and duraplus triplewall chimney, installed when I built the house March of 2019, stove is in finished basement, doublewall stovepipe from stove, to thru the wall install of duraplus that then goes up outside my house. It has been burning well for me, and I cleaned chimney last may, and then again just last week. (Didn't get much but a little bit of shiny black flakes either time). On to the issue, I came home from work today to my wife telling me she had a "roaring good fire going" earlier and house was toasty (she was very proud of herself). I asked and she mentioned that the stove got to 500 and she turned the air back the whole way and she thought she checked it later and it didn't get much hotter, sounds ok so far I'm thinking, I went down to see if I needed to add wood and in horror realized she hadn't shut the door completely tightly, latch had engaged somewhat, but my guess is a dollar bill would not be held by it, so, armed with the knowledge that our stove may have been overfired due to air leak at the door, I checked it to the best of my ability and found no readily apparent cracked welds, sagging airtubes, etc. My question is how/ what do I look for on the chimney to see if it is damaged? I can easily look up it thru service port at the bottom of the thru wall "T", just not sure what if anything to look for,. Any tips would be extremely helpful, (plus, anybody got an idea on how to mount a padlock on a woodstove door? )