This is a simple adapter using a fan for Oxbox vision air snorkeling mask
I use a fan because breathing through ffp2 filters can be difficult.
Its just a prototype but could be used as a base for others.
It was build using fusion 360 (file in download) and a 40mmx40mm fan
Print with 0.15 mm layer height and 100% infill
The author hasn't provided the model origin yet.