120mm fan to 4 inch ducting adapter

I use this adapter to connect the 120mm fan and 4" ducting in one of my laser engraver test video:

Print Settings

Printer Brand:

Prusa

Printer:

i3 MK3

Rafts:

Doesn't Matter

Supports:

No

Resolution:

0.3mm

Infill:

20%

Filament: Any Any Any