- 19
- Aug
emergency escape door,fire door lock,commercial fire exit doors
The steel fire door has good air tightness and is closed very tightly without leaving a crack, allowing air conditioning and heating to overflow. When the steel fire door is opened, only 1KG force is required, and the opening tension is less than 50N. Even people in wheelchairs can open it easily.
https://ztfiredoor.com/24160.html
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