Njengoko sonke sisazi, iingcango zomlilo zineenzuzo zokugquma ubushushu, zibambezela ukusasazeka komlilo, kunye nokuthintela umsi. Xa kuvela umlilo, unokudala iimeko ezifanelekileyo zokuhlangula abasebenzi, ipropati kunye nezakhiwo, kunye nokunciphisa ilahleko. Kukho amabakala amathathu aqhelekileyo okumelana nomlilo kwiingcango zomlilo zokugquma i-thermal: iBakala A (1.5h), iBakala B (1.0h) kunye neBanga C (0.5h).