Heavy-duty Steel Fire Door Made in China, Fire Resistance From 30 to 180 Minutes, Suitable for Commercial and Residential Safety

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30 Minutes Fire Retardant Door Product Description Pipeline fire door refers to the door installed in the shaft of the building. Generally, it is a Grade C fire door, which is made of wood or steel. Pipeline wells are the strong and weak electric wells inside the building. They are one of the key parts of fire safety. The strong and weak electric wells are also called strong and weak electric rooms. The safety of them is directly related to the use of electricity, water and