According to the fire resistance of steel fire doors, different grades of steel fire doors can be used in various places.

https://ztfiredoor.com/23905.html

steel fire rated entry doors,4 fire doorsnominal fire door rating,sliding fire doors domestic,1 hr fire door,fire door inside,steel fire rated entry doors,Metsotso e 60 ea mollo o nang le lere la marulelo a marulelo,sliding fire doors domestic,lekhasi la monyako o lekantsoeng ka mollo,steel fire rated entry doors,lemati la tšepe le lekantsoeng ka mollo le fensetere,4 fire doorsmonyako oa mollo o otlolohileng,sliding fire doors domestic,mamati a thibelang mollo,4 fire doorsmonyako oa tšepe o sa cheng