Iminyango yesivalo somlilo inemisebenzi yokuvimbela umlilo, ukuvala ukushisa, ukuhlukanisa intuthu kanye nokucisha umlilo, futhi ifanele amagaraji, izindawo zokugcina impahla, ama-pavements, njll. Umnyango wesivalo somlilo awushisi kakhulu. Uma i-alamu yomlilo icushiwe, isivalo se-shutter siyehla ngokuzenzakalelayo.