If the gap is just over the top of the stairs, it is important elevation in place of rotation to overlap, to avoid head injuries. It should be not less than 2 meters.
Kama pengo ni juu ya juu ya ngazi, ni muhimu kimo katika nafasi ya mzunguko na hufunika, ili kuepuka majeraha ya kichwa. Ni lazima si chini ya mita 2.