Adapter - 80mm Exhaust Computer Fan to 2.5 Inch 65mm Hose Coupler

I made this to run a fan on low to create a slight negative pressure inside my enclosed printer. the fan is inline with the exhaust hose, which is vented out a window. My intent is to pull fumes outside when printing Nylon and ABS. 

For use with an 80mm computer fan (with variable speed control) and 2.5 inch (65mm) hose. I'm using four M4 40mm screws to hold the adapters to the fan.

I made 45 degree tube adapters to help route the hose. You can glue them on if you need, or use without.

No support necessary. I did use a brim on the 45 degree tube to ensure it adhered to the build plate well.