Commercial steel fire doors can be provided with windows, shutters, ventilation shutters, etc. as required, and the surface treatment is electrostatic spraying.

https://ztfiredoor.com/23836.html

light fire exit door,soft close fire door hinge,hose fire fighting cabinet mild steel single door,flat push bar fire escape door lock,commercial fire door,light fire exit door,comercial fire doors,soft close fire door hinge,door commercial exterior fire rated steel doors,flat push bar fire escape door lock,vision panel fire doors,light fire exit door,in door fire place door,soft close fire door hinge,metal fire proof door for interior,flat push bar fire escape door lock