![What’s inside the fire doors](https://repairsl.metaldetectorsforgold.net/wp-content/uploads/2014/05/49kioj41do-150x150.jpg)
What’s inside the fire doors – Let’s consider the fire door in the section. Any fire door certainly has an inner and an outer layer . The main “internal” materials – thermal insulation ( to the front door as much as possible not ignited ) . The outer side of the front door – metal […]