Illustration
1.

1250mm LW x 2500mm SW
Illustration
2.

2500mm LW x 1250mm SW
LW:
Long way of mesh dimension
SW: Short way of mesh dimension
Illustration
3. Raised Mesh Dimensions

The
Long Way of the mesh pitch and the Short Way of the mesh
pitch are measured from knuckle to knuckle
Illustration
4. Flattened Mesh Dimensions

Long Way and Short Way measurements are aperture dimensions