These gratings have a mixture of cone and round perforations with drainage effect. They can be utilized inside and outside. Graepel Round N 08 is suitable for barefoot walking and the stainless steel design can be used in indoor swimming pools.
The lateral system perforation simplifies the installation of the gratings.
The open area for standard grating widths is approximately 9 % for the type Round N 08 and approximately 21 % for the type Round N 12.
Program-controlled perforation groups are possible.