I modified my cold smoker adapter by using the flexible foil type dryer hose. It's been a while since I used it, and I can't remember all the steps I did. I'm in the U.S., so the standard diameter for a dryer hose is 4-inch. This diameter was smaller than the hose that came with the adapter. So I will have to check exactly what I did to attach the 4-inch hose to the adapter. Running the 4-inch hose through the opening of the side of the Bradley was no problem. The flexible 4-inch hose fits snuggly through that hole in the side of the Bradley.
I not longer use an online photo hosting so I will not be able to post pictures, but once I take a look at what I did, I can write up the instructions. It was a fairly simple fix.