Originally posted by Doug Smiley:
...or use this???
Vortex High Velocity RV Roof Vent Retrofit Kit
by Hengs Industries
26 customer reviews
Price: $54.90 + $10.49 shipping
In Stock.
Replaces Old Inefficient Fans With New High Velocity Fan
Can Be Retrofitted To Any Existing Vent
No Need To Risk The Roof Seal By Replacing The Entire Vent
Can Be Done Easily With Only A Phillips Screwdriver (Instructions Included)
Also Works On Non-Power Vents With Some Simple Wiring
http://www.amazon.com/Vortex-H...words=rv+exhaust+fan