6 Inch Duct to Flat Window Exhaust

Should be printable without supports or a brim with the duct side facing down towards the build plate. Used 3 wall loops and a .12 layer height but I was being conservative with my settings and adjustments would be able to cut down on print times. 

Duct adapter outer diameter is 5.75 inches that will fit into 6 inch ducting by AC Infinity. Will be snug so wiggle it in. The flat end measures 245mm length wise, that was meant to fit into my basement window as pictured. Wall thickness is 3mm but also if reducing the thickness, maybe it'll need a brim when printing. Feel free to tailor it to your needs!

Modelled in Fusion 360.