thickness (t) height (h) app. open area app. kg/m2 app. min. grid (p) diameter single relief waterflow direction std. width x length max. width x length
mm mm % mm mm mm mm
1 1.3 - 2.75 3.0* 3 // length of sheet 1000 x 2500 1000 x 3000

*The grid (p) is fixed on this measure.