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
1.5 2 - 4.13 50.0* 20 - 2500 x 1250 3000 x 1500

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