Umnyango wokungena komnyango womlilo ubhekisela kumnyango onokuhlangabezana neemfuno zokuzinza kokumelana nomlilo, ukunyaniseka kunye nokufakelwa kwe-thermal ngaphakathi kwexesha elithile. Umnyango wokungena kumnyango womlilo ngumnyango onokuchasana nomlilo othile ofakwe kwindawo yomlilo, i-stairwell yokuphuma, i-shaft ethe nkqo, njl.