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The door panel and the door frame must pass the guidelines of a testing agency that provides the product listing. The door frame is composed of the fire or smoke seals, door hardware, and the structure that holds the fire door in place. These components form an assembly called a doorset which holds a numerical rating - the number of hours of resistance to test fire. All components must have a listing agency label to ensure that they have been tested to pass the fire rating requirements.So Shanghai XunZhong Company has pass UL listed for Steel fire doors in 1,2,3hours issued by UL company directly.Also we have UL certification for wooden doors up to 2 hours . More importantly,our certification could hold glass panel.

Fire doors are not always noncombustible. Some portions of the door may be destroyed by combustion during exposure to fire; this is acceptable as long as the door assembly passes the fire test criteria of limiting temperature on the non-fire side of the assembly.

The goal of the fire door is to slow down the spread of fire from one compartment to another for a limited amount of time enough for occupants to evacuate. Fire doors create a protected route to safety, assist the fire brigade and withstand the attack of fire for a limited time.

Nonetheless, occupants are not always protected from smoke and fire by the fire doors. Poorly maintained and incorrectly installed fire doors pose a great risk to the occupants of the building and may result in fatal injuries. Fire doors must be properly installed to reduce the risk of failure; gaps must be appropriately filled with fire-resisting sealant. Also, it is important that they are regularly inspected by a professional to ensure safety.

For additional information, contact XunZhong today and protect your home, office or business from the dangers of fire outbreaks. We service throughout North American offering a complete fire protection service including supply, installation, testing, servicing, and maintenance. When it comes to protecting your family, staff, customers, and property from fire, Xunzhong has the right advice, products, and services.