Inline fan for 3D Printer Ventilation - 100mm / 4 inch ducting

This is the next version of 3D printer ventilation I've built for my 3D printer enclosures. The video shows how the ducting, ducting connectors and gates were installed. It also shows how I researched and designed an inline fan using PC fans. All parts were designed in Fusion 360 and 3D printed in PETG. I find the ventilation removes the smells of 3D printing which is great when working in small spaces. 

Video on how I researched and designed the inline fan with enough suction.

The first version ventilation system is shown in this video: https://youtu.be/dnUz8IxtlMo 

The PC fans I used are the 12 volt Cooler Master SickleFlow 120mm Red LED Fan which has a static pressure of 2.5mmH2O.  Two PC fans are housed in the case with a stator between them. Check out the video to see the assembly. Remove the rubber vibration tabs from the PC fans corners before installing.

Print Settings:

• No supports required.
• I used PETG for strength and longevity. PLA not recommended.
• Print with at least 5 walls for strength.
• 25% infill.

The Outlet and case are glued together with epoxy glue. Inlet and case are connected using eight M4 bolts 16mm and nyloc nuts.

The STLs for ducting connectors are located here: 

4 inch / 100mm Ventilation Ducting Connectors and Outlets
https://www.printables.com/model/1078878-4-inch-100mm-ventilation-ducting-connectors-and-ou

Bambulab P1S Enclosure Exhaust Outlet Connector
https://www.printables.com/model/1078881-bambulab-p1s-enclosure-exhaust-outlet-connector-fo

UPDATE 17 Feb 2025: Added the Fusion f3d file version with 75mm inlet and outlet. I think this makes it a 3 inch duct version. Just modified the outlet dimensions in Sketch 3 and then dragged the curve slightly in Sketch 6 to make sure the wall thickness was consistent. Haven't tested what effect reducing duct size will have but should be ok. Filename is: Extractor Fan Turbine Case v8 75mm version.f3d