Before we light our woodburner this year, I need to have the chimney swept again.
Last time it was done, we used the (flexible) poly type brush on rods, from the bottom up over.
This time though, I want to use the metal type 'flat' bristle brush for a more thorough job, I feel the poly brush was not stiff enough.
Just the problem is, what size brush for a 9" brick flue? I know the poly type would just flex about up the flue, but the metal type have to be only slightly bigger than the flue - but just how much bigger, 2 inches or more?