Iyi yemhando yekushandisa ndeyekuvandudzwa kaviri-deya grate vertical yakanaka yekubatanidza simba risingakoshi husina simba. Imwe neimwe grate ndiro ine convex arc-yakaumbwa yakashanda yekuvandudza chimiro uye inoshandiswa kuburikidza neiyo yakatarwa shaft; Iyo inoratidzira seti yehurefu hunogona kufambisa pamvura yemvura inogona kufambisa pombi yemvura, pamwe chete nechiteshi chekupa ma grate
