The Side sliding two leaves fire retardant door is installed onto brick or cement wall, or onto a coated frame, it is mounted on an inclined guide and can remain stopped in that position. The door is implemented with a counterweight and of a thermal fuse or of an electromagnet. In case of fusion of the thermal fuse or in case of release of the electromagnet, the door automatically closes, sliding on the inclined guide by gravity
An electric feeding is not necessary because the door can be moved manually. Some accessories, if used, ask for the relevant feeding, e.g. the electromagnets that keep the door open and leave it to close in case of alarm.