Ventilation fan plenum adapter

Designed to improve ventilation in a compartment (in my case, a refrigeration compressor located under a settee). On the outside, you see a normal vent. Inside (mounted to the wall/board/whatever is a plenum to match the fan to a round vent.

The whole thing is parametric (adjustable). You'll need the latest NIGHTLY version of OpenScad. Don't forget to hit generate after making changes, before exporting the STL. There is wide variety of vents available from Amazon.

Printed in PLA, 4 walls, 8 pct infill.

Being PLA, it's soft enough that standard fan screws will byte into it without cracking.