Flue rear cover

[0Floz0]

Hey all

Not sure what the part is called but there is a big gap between it and the metal part of the flue. The reason is that the metal casing is sticking out at the bottom more than the top.

Is this an issue? I could cut the metal back a bit so it’s flush but not sure how necessary it is.

Thanks all

 

[cross thread]

As long as the wall is sealed it’s a decorative piece,

 

[0Floz0]

As long as the wall is sealed it’s a decorative piece,

Yeah it’s got foam going round it. So no issues there. I guess it lets a draft in not being flush as well. As the flue goes through the metal cylinder but with a big gap round it.

 

[Madrab]

Just called a flue collar - internally, as suggested, it's just to cover the hole between the flue and the wall, externally it called a weathering collar and should be weather and UV proof. Both ends of the flue needs to be filled to fill the annular space between the flue and the fabric of the building, there should be no gaps, draughts mean there are and it needs filled properly.

 

[0Floz0]

Just called a flue collar - internally, as suggested, it's just to cover the hole between the flue and the wall, externally it called a weathering collar and should be weather and UV proof. Both ends of the flue needs to be filled to fill the annular space between the flue and the fabric of the building, there should be no gaps, draughts mean there are and it needs filled properly.

Sorry, I might not be being clear. There is a metal cylinder that runs through the wall. There is no gap between the outside circumference of this and the wall. The actual flue itself is a much thinner pipe that runs through the metal cylinder. So there is a gap between the flue and the metal cylinder. Without that collar being flush at the back, I think it could allow a draft to track back through.

Yep, I’ve got a rubber type collar on the outside that’s flush. Which now that I think about it, should stop most of the draft. But would be nice to be sure.

Think I’ll Dremel the protruding edge and then some silicone to get a decent deal round the collar. Any reason that’s a bad idea? Boiler will be off when I do it because of the sparks.