Exactly what I want to use the curtain for. And to stop dust.I always remember old corner shops having bead curtains to allow air flow but stop flies I guess. These PVC look like they are a modern version I am really surprised how good they are at holding heat. One of the datacentre I'm in every week has them in areas where a rack has been move so that they maintain the hot/cold aisle divide, if you put your had through you feel the difference in temperature.
I can see them being really useful to allow light in but still provide some protection.