Flexible Duct Fan Connections

I added a laser to my 3D printer and needed a solution to vent the fumes outside. These two pieces are made to be attached to the ends of 4" flexible duct to allow for proper ventilation. The 'Fan Duct' has the opening and hold pattern for a 3.5" computer fan. The two were bolted together with the back wall of the printer case in between as pictured. The 'Fan Exhaust' fits the same 4" duct work and can sit free standing on a window sill. In the picture I have opted to connect it to a full w