Reply by jayscott

I looked at turning the fan wheel to rotate in reverse but wasn’t able to get my hand past the motor to tighten the nut at the hub. I could bend a blade to let me inside the wheel but it will be a last resort trial. A diffuser on the outlet also has possibilities that I’ll have to investigate.

The most promising is closing off the inlet but during rough trials I did when I first got the fan, closing it off too much made the fan vibrate too much. I’ll have the find the sweet spot.

Thanks to all those who commented. The suggestions were very much appreciated. If I make a break-though, I’ll post the results.
Jim