Iminyango ye-fire shutter isetshenziswa kabanzi ezindaweni zokuhlukanisa umlilo zezakhiwo zezimboni nezomphakathi, ezingavimbela ngokuphumelelayo ukusabalala komlilo nokuqinisekisa ukuphepha kokuphila nempahla. Ngokusho kwemithetho yokulawulwa komlilo, umnyango wokuvala umlilo uyindawo ekhethekile yokuvikela umlilo futhi akufanele isetshenziselwe ezinye izinhloso.