It will be noisy without the silencer part of the tube.. we used the plastic ones with no issue, it's a baywindow youll be lucky to get much heat out of it!!
I used two pieces of stainless steel FLUE tubing from the local gas shop and then covered in exhaust wrap from ebay.
Cheap fix , colour coded wrap :lol: and the size if memory serves was 85mm and held in place with 4 large jubilee clips.
It will be noisy without the silencer part of the tube.. we used the plastic ones with no issue, it's a baywindow youll be lucky to get much heat out of it!!