Steel fire doors can be equipped with windows, louvers, ventilation louvers, etc. as required. Many people can survive a fire, because fire doors can prevent the spread of fire.

https://ztfiredoor.com/13341.html

painted fire doors,cendrex fire rated access door,fire door into garage,heavy duty fire door,metal framed internal fire doors,pre hung fire door sets,insulated fire rated access door,fire door double leaf,cendrex fire rated access door,sliding fire doors internal,heavy duty fire door,double internal fire doors,insulated fire rated access door,fire rated outswing door,cendrex fire rated access door,heavy duty fire door,fire rated door casing,insulated fire rated access door