My question is there are main types of flues out there from single wall to multi walled. Is there a stamp, label or a marking of some sort that I should be looking for that tells me what type of flue it is.
Further more what are the appropriate clearances for a single walled pipe compared to a multi walled pipe. Along with the clearance issue I have read in some posts that because fiberglass insulation is not flammable that it can be in contact with a flue but cellulose insulation can not. If someone knows of a good website with this information then please let me know. I have also attached some pictures that might present some more discussion.
I have also attached a picture of a water heater flue located in a garage that is missing a collar at the ceiling. I called it out because of the fire rating between the interior and exterior of the home. I just wanted to know if that how you would call that issue out or if it’s an issue at all.