Just went to install the Maxx Air Flow but was disappointed to find that with it on my vent would only open about half way. Seems like the Maxx Air ll might be in order. Think it has a little more depth. Then I thinking, the vent is over the bathroom. We generally keep the bathroom door closed so how much help can it be. Do worry about forgetting the vent is open every time it rains.
Jayco Jay Feather x23j
2011 F150 4X4 Screw, 5.0, 3.55 rear axle, 6.5' bed.