I've always wondered about this. Mainly for bellypans.
Quote:
Anisotropy
Anisotropy is the property of a material which allows it to change or assume different properties in different directions as opposed to isotropy. It can be defined as a difference, when measured along different axes, in a material's physical or mechanical properties An example of anisotropy is light coming through a polarizer. Another is wood, which is easier to split along its grain than across it.
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Years ago I posted a link on Ecomodder to a study that showed a cattle truck with round holes at the front of the sidewalls was better than the rectangular horizontal slots that are more common (at preventing suffocation of the livestock!)
Window screen is flexible. Were you thinking of using it for daylight openings?
It's all holes. Maybe a perf metal with some arbitrary hole size and spacing is optimal?
So many questions. When I was in high school and college I worked summers in a feed & seed mill. They had stacked graduated stainless steel screens about 4x6 feet in a shaker for sorting mill run into different seeds. hole sizes below an inch or so.
The place burnt down a decade or two ago.