flamingojh

The grille I believe was a woven wire mesh ( metal - something like this Woven Wire Mesh - Metal )- most likely an aluminum or stainless steel. Obviously, these alloys are not naturally black, so this material was most likely either powder-coated or just maybe plain old spray painted to give it the black effect. The openings look pretty tight (in order to not let anything in, rocks, etc....) so I would guess this was maybe about a 30 x 30 mesh. 30 wires per inch in either direction.