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 s