Most RV bathroom vent fans are really weak. I decided to replace mine with the Vortex II fan. I chose it over the fantastic fan because I didn’t want to break the seal on the roof to install a fantastic fan, here is a short video of my install I hope this helps …good luck. http://youtu.be/C_qc110C-Mc
Great vid 🙂 I have an itty bitty fan in my 89 bounder and that new fan you put in looks nice. I might have to look into replacing mine with one of those. I guess my only worry is how much less natural light it may let in.