Fanantastic Fan Upgrade

Fan Upgrade/Cover
On my mission to put a cover over the Fan/Vent in my Class C RV. I want something to keep the rain out if I have the roof fan on & open when it starts raining. I stopped by camping world. The teenager there really did not have much valuable input on the topics of vent covers ;-) I picked up the entry level Maxxair cover for $20. I was ready to install when I decided to do some informal testing on the air flow. There was an appreciable decline in air flow. I would roughly estimate the reduction in airflow to be about 30%. I had previously read this on the forums. But, I did not think I would be able to notice the 30% reduction on medium speed. So, I decided to upgrade to the larger Maxxair 800 model (normally $90 but I found for $66 online). Right after I ordered I received an email from a group member telling me he did not think the 800 was much better than the cheapo version. After some more discussion I ended up changing my strategy and buying a replacement fan housing. This adds a thermostat and a rain sensor that will automatically close and shut off the fan if it rains. I think that will best fit my needs. 

Info here:
http://www.fantasticvent.com/products/model_6600_kit/model_6600_kit.html
Good deal at Adohen Supply
http://members.aol.com/fantasticvent/upgrade_kits.htm

They have a $169 model that adds 14 speeds and a remote control but I did not want another remote to keep up with so I went with the #6200. Reportedly easy to install. I will let you know how it goes :-)