The steel fire door has a good airtightness, and the closing is in place and tightly closed, and it will not leave the door gap and cause the air-conditioning and heating to overflow. When the steel fire door is opened, it only needs 1KG force, the opening pulling force is less than 50N, and the door handle is set at a height of 700-1100mm, which can be easily pushed and pulled by both adults and children.

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