When a fire occurs, a large amount of smoke will be generated, and the smoke detector on the fire door will send out an alarm signal and give an alarm in time.

https://ztfiredoor.com/20842.html

upvc emergency exit doors,fire rated emergency exit doors,external fire exit doors,commercial fire exit doors,metal fire exit doors,upvc emergency exit doors,fire exit alarm,fire rated emergency exit doors,upvc fire exit doors,commercial fire exit doors,emergency exit door price,upvc emergency exit doors,steel fire escape doors,fire rated emergency exit doors,fire exit alarm,commercial fire exit doors,panic exit door,fire exit door alarm