Do not restrict air flow.
The fan is moving 1100 watts of heat . Buy ten inch flex duct from Home Depot
Put the fan inside duct along with a few inches of the metal case.
Point the duct at a window. Or a vent you cut into the house.
And not a shitty little four inch dryer duct.
Understood, I have a 3000CFM fan already mounted which will suck the exhaust through the flex and dump it in my attic, so I will just size the flex appropriately and not use an adapter.