T
tamz
We know that but follow the rules and classify it to suit. You can only pysh with what you have. Btw my boiler flue is fitted well in line with clearances and is 4 or 5 m away (on another wall) at 90 deg to my back door. The prevailing west wind was blowing the poc's right in the door when it was open (probably the same as it was before it was a steamer but now i could see it). I altrered it anyway as it annoyed me even though the poc's would have been diluted.