Strong Galvanized Steel Material Fireproof 90 Minutes Rated Fire Resistance Time Door

UL (Underwriters Laboratories) Listed fire rated steel doors are doors that have been tested and certified by UL to meet specific standards for fire resistance and safety. These doors are designed to prevent the spread of fire and smoke for a specified amount of time, usually ranging from 20 minutes to 3 hours, depending on the door's construction and the intended use. Some common features of UL Listed fire rated steel doors include:

Steel construction: Steel is a durable and fire-resistant material that provides protection against heat, fire, and smoke.

Fire-resistant materials: Fire rated steel doors typically have a core made of fire-resistant materials such as gypsum or mineral wool. These materials are designed to prevent the spread of fire and smoke and to provide insulation to reduce heat transfer.

Intumescent seals: Intumescent seals are materials that expand when exposed to heat, forming a barrier that helps prevent the spread of fire and smoke.

Self-closing and positive latching: UL Listed fire rated steel doors are typically self-closing, meaning they will automatically close when they sense heat or smoke. They also typically have positive latching mechanisms that keep the doors securely closed, even under the pressure of a fire.

Label and labeling: UL Listed fire rated steel doors are marked with a label that indicates the door's fire rating and other relevant information.

Installation: Fire rated steel doors must be installed in accordance with UL and building codes to maintain their fire resistance and safety.

It's important to note that UL Listed fire rated steel doors are not fireproof, but they are designed to provide a level of protection against fire and smoke for a specified amount of time.