BBQ 97mm to 40mm Blower Server Fan Duct press fit 1012 KH302

this should also fit ANY fan with a output size of ~58mm x ~33mm

i designed this blower duct to attach to a Delta KH302 BFB1012EH blower fan, to use for stoking a fire pit which had a 50mm pipe put through it with air holes. to allow the middle of the fire to suck in air from outside

the outside of the top circle is 40mm and 33mm between the two flat sides.
it is a press fit onto the output of the fan.

thickness of the walls is about 2mm, however it does get quite thin in a couple of spots where the fan presses in.

Haribo Prusa i3 mk2
printed at 60mm/s
0.2mm layers
ABS @ 245C with a 40% fan in a enclosure which reaches about 50C
supports are required for the lip where the fan pushes in until.
this lip is about the same thickness as the fan case, so has a nice smooth airflow.

yet to test this on the fire pit, hoping that a 12v 3amp fan, moving a lot of air through the plastic will keep it cool enough to not melt. (thus why the walls are only 2mm thick)