Workshop Air Cleaner connectors

These connectors are what I needed when making a DIY air filter system for my woodworking workshop. I've used a 6" fan/motor hence these are sized for that, I guess they could be reduced in order to make them fit the 4" version of the motor. The outer 2 pieces could be thickened up for more rigidity, however, I've used the profile I've uploaded for speed, and it seems to be working just fine. If anything, I imagine you could increase the size of the Z axis and that would thicken things up a bit. I made a video showing the build of the system with testing here, there are links to the filters and motor I purchased for the project in the description -