News-集曼（江苏）特种门业有限公司

Jiman special door

Classification and Difference of Fire Door Grades
Fire doors not only have the function of ordinary doors, but also have the function of preventing th

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2020.3
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What material is the fire door made of?
Due to different materials, fire doors are commonly classified into wood, steel and steel wood.

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2020.3
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What about fire doors? How to distinguish between good and bad?
The surface of the fire door should be flat and smooth without obvious dents or mechanical damage. T

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2020.3
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How does the door closer of a fire door work?
A practical and indispensable part on the fire door is the door closer. So how does the door closer

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