Tell us about yourself!
https://www.youtube.com/watch?v=6Xy5cAYtIiUThanks,I went 3" all the way to the connection in the window where I enlarged to 4" so I could use a rectangular heat trap fan. I also insulated the docking, 10' of which is made out of an old 3" pvc gutter down spout.excuse my video in French.
here's the fan.
Here's the fan.
https://www.youtube.com/watch?v=6Xy5cAYtIiUFrench video.I went 3" ducking, insulated, all the way from the pannel to the connection in the window, where I enlarged to 4" so i could use a rectangular heating trap fan.