In machinery spaces and some radar offices it is necessary, in order to safeguard personnel and equipment, for the 'user' department to control fans and openings in gastight conditions.
Kwizi thuba zomatshini nakwi ofisi zezixhobo ezibonisayo kuyimfuneko, ukugcina bekhuselekile abasebenzi nezixhobo ukuze nangenxa yesebe elisebenzeyo libenokulawula iziphozisi neendawo ezivulekileye kwimeke yokungengeni gesi.