Window ventilation using old computer fans

This is a simple fan duct i designed for use with two old compuer fans (80mm x 25mm) I had laying around. It is designed for a 89 mm hole in an acrylic/plexiglass window, I cut the hole with a wood hole saw with a lot of water for cooling. I designed it to work with 105mm aluminium (stiff) ducting withoout having to use a hose clamp, I simply slit and bent out small peices of the end the ducting (with regular siccors) and secured in place with the locking ring and 3 screws.

It requires 3 screws (30mm x 3mm shaft x 5mm head), some contact glue to fasten the window adapter to the window, a small electronic switch (I used a 12mm round switch that presses into place), two 80mm x 25mm computer fans, a 12 volt (or other matching your fans) power supply, I just used an old charger, and some wire and basic soldering/crimping. I also sealed mine with some silicone between the acrylic and 3d print but that is not strictly neccisary.

It is printed with standard prusa slicer pla settings an