Originally Posted by headchange4u
If you set the tarp up perpendicular to the wind you probably would not get much air flow through a top vent anyways, but even when I have the tarp pitched close to the ground for rainy or windy conditions I get air flow all around the hammock.
I would think a top vent would be necessary if you were using something like the JRB Tart Tents which are totally enclosed.
On a trip not too long ago, it was chilly (40* low) but a bit humid...I got condensation all over the bottom of my tarp, without end covers
. I think it was because I didn't pitch one side high on my trek poles that night. And because there wasn't much wind.