Originally Posted by Murphie
Did you happen to replace a existing vent cover with the fantastic fan vent cover?
I installed a fantastic fan in our bedroom vent and was disappointed with the limited air drawn in because of the max air vent cover I still used. The Fantastic fan vent cover is about 70 dollars and didn't want to spend the money and time if the results were only marginally better.
I replaced the existing factory roof vent with a Fantastic fan in the existing hole.
I added a vent cover over the top of that.
When I installed it, I tried to make sure I adjusted the front/rear position of the vent cover to allow the Fantastic vent to be cranked open the maximum amount possible.
Trying to quantify the amount of air moved is hard to do. But our perception is the Fantastic fan functions better as an exhaust fan. We open some windows thru which air can be drawn in and exhausted out the Fantastic fan.
My principle reason for adding the vent cover is for protection from falling branches, hail stones etc. A few years back we had a bad hail storm in our area. (We got a new roof on the house courtesy of the insurance company
) At the time, I was working for a RV dealer in the parts dept. We had almost an immediate 'rush' on our replacement vent lids. We sold maybe a couple hundred over the next few weeks. We couldn't get them in quick enough. Some of the vent lid remnants people brought in had 6" holes smashed thru them. The busted lids in effect opened the roof up to rain coming in unchecked thru the roof.
After that, it became a no-brainer to me that adding a vent cover was a smart move and good insurance.