Iingcango zomlilo zegumbi elibandayo kufuneka zenziwe ngezinto ezingenakutsha ze-thermal insulation ukuhlukana komlilo othe tye kumgangatho ngamnye. Umnyango womlilo wegumbi lefriji kufuneka uxhotyiswe ngesixhobo sokubalekela. Ukuba abantu bangena kwindawo yokugcina impahla ngempazamo, ucango lwesitora luxhotyiswe ngesiphatho sokubaleka. Ukuba ucango alonakalanga, into evulayo inokutsalwa ukuze ibaleke ingozi kakuhle.