The cross bars should be placed on the top. The gratings should be firmly attached to their supports under the following methods:
This method is suitable for gratings which are permanently installed or rarely removed.
This method is suitable for gratings which are removed quite frequently. The method is applied to avoid damaging grating itself.
When a cut-out is necessary to fit a round-shaped obstacle, the diameter of the cut-out corner should be at least 50mm wider than that of the obstacle.
All rectangular cutouts are made with a space no wider than that of the flat bar of the gratings.