Replacing the screen is very easy however, finding a mesh small enough to keep out small gnats or as I call them, flying teeth, will probably prohibit ventilation.
We were in St Mary's Ga a few years back, on a cool December day, staying at Crooked River SP. Setting up was a task while being eaten alive by gnats. Inside, we had the windows open enjoying the cool salt air when I observed the ceiling covered with brown/black dots moving like a stream. It was our flying razor teeth friends having a family reunion.
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