The surface of fire door frame and door leaf shall be free of obvious concave convex, scratches and other defects.

https://ztfiredoor.com/23836.html

nternal fire rated rising falling butt door hinge,door lock fire resistant,internal wooden fire doors,door lock fire 2 hour,door lock fire security,steel fire rated door for main entrance,door fire cabinet,nternal fire rated rising falling butt door hinge,fire-rated tubular door core,internal wooden fire doors,internal fire doors,steel fire rated door for main entrance,internal fire door frame,nternal fire rated rising falling butt door hinge,door coordinator fire door,internal wooden fire doors,steel fire rated door for main entrance