Actually, my old Fogscreen was designed to be in any orientation as the fog was piped into the fogscreen. My new fogscreen has an internal tank so it can only blow fog downward. That is how I have kids walk through it on Halloween.
To be honest, I think the round shape of the straws actually provide a better laminar flow. The Honeycomb material I am using is more uniform though. My first fogscreen was made out of drinking straws and I noticed that from one straw to another, the "roundness" varied quite a bit. How much any of this affects air, I don't know. I just know that both work.If you used straws for both the mist channel and the surrounding "curtain" air, would there be any difference vs the honeycomb material? I'm wondering what the specific advantage the honeycomb shape has with regard to maintaining the smooth laminar flow.?.
It's hard to make a comparison though because the honeycomb cells are 3/8" and the straws were 1/4". The straws were longer too so, all of these variations make it hard for an honest and fair comparison.