Indlela yokulinganisa yehholo lomnyango we-elevator upper sill
Hlukanisa isamba sobude obukaliwe ngo-2 futhi uzungelezele kuso sonke esiseduze ukuze uthole inani lokuvula umnyango (isibonelo: 1690÷2=845mm, okuwu-800 wokuvuleka kwezicabha)