Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works for me...

I installed this vent on a pickup fiberglass topper which I converted into a simple camping setup. It has handled a few years and several trail/camping trips so far pretty well. I have been careful to keep it closed when around tree branches.I do need to be sure it is closed with some tension on it...other wise it will open up and cause a lot of air drag on the highway. I used some foam under the back of the lid to keep it open about 1/2" all the time to allow some ventilation while it was closed down with tension on the foam.