Ron3rd wrote:
Max Air II is superior to the original in every way. Allows you to open your vent more and lets in more air. The vent cover from Fantastic is great, and allows even greater opening, but too pricey for me.
I probably does let more air in, but I am more concerned with the rain protection. It is for the front roof vent on my AF 990 and it is sloped down towards the front and is not on a level part of the roof. I should go to an RV place and take a look at one and put it up on my roof to see if it would protect from the rain enough.