In order to prevent rodents from entering the sewer mesh should be less than 10mm. "Food Service Food Safety Code of Practice" of the provisions: food service providers should be set up in the outlet of the drain mesh aperture diameter of less than 10mm of the metal grille or mesh, to prevent rodents from intruding.

In order to prevent rodents from entering the sewer mesh should be less than 10mm. "Food Safety Code of Practice for Food Service" provisions: food service providers should be set up at the exit of the drain mesh aperture less than 10mm metal grille or net cover to prevent rodent intrusion.