Fire-Rated Metal Doors' Materials The criteria that govern the manufacture of our hollow metal doors and frames define the level of fire safety protection in terms of UL safety ratings. Steel materials such as galvanized, galvannealed, cold rolled, and hot rolled steel are utilized to create our doors. These metals are easy to work with and provide good durability for most applications. The main advantage of using metal for your door is its ability to resist heat which helps it remain functional even after being exposed to extreme temperatures. This makes these doors useful in areas where there is a risk of fire breaking out. Metal doors can be painted or coated with protective finishes to help prevent corrosion and keep out moisture. For extra security, metal doors can also be fitted with lockers, deadbolts, or other devices that require keyed entry. Types Of Fire Protection That Can Be Installed In A Metal Door Bonfire doorbell camera fire alarm pull station rescue tool box There are two types of metal doors available on the market: single-panel and double-panel. Both types protect against fire from only one side; however, they do so by using different methods. Single-Panel Doors have one flat surface that faces into the room while the other side is exposed. If a fire occurs on that side, smoke will be able to spread quickly to other parts of the house.