parametric flue pipe '0.20'

One of my parametric flue pipes, you can find more at
https://github.com/benjaminwand/3d-printed-labial-pipe

The specialty of this flue pipe is that the angle of the labium can be adjusted.

Use a tube to make it as long as you wish. If you are unsure about length-to-diameter-ratio, have a look at https://www.ccoors.de/webpipecalc/