Panel for at least one fire protection of a wall face, in particular a movable wall, more specifically a door or shutter, said panel being intended to be attached to said face to be protected said panel comprising: - a steel sheet having a minimum thickness of at least 0.5 mm, in particular at least 1 mm, said sheet of substantially rectangular or square shape having four folded edges (10,11,12,13) each having a height of at least 5 mm, in particular from 5 mm to 30 mm, so as to substantially form a bowl with a bottom delimited by the folded edges (10,11,12,13), each of said folded edges advantageously extending in a plane substantially perpendicular to the plane in which said bottom extends; - an advantageously porous calcium silicate-based non-flexible layer with a binder hardened by autoclaving, said layer having a thickness of at least 20 mm, said non-flexible layer defining a substantially parallelepipedic body presenting a first substantially rectangular or square face, a second substantially rectangular or square face opposite said first face, four lateral faces extending between said first and second substantially rectangular or square faces (30,31); the first face of said layer based on calcium silicate bearing on the bottom of the bowl advantageously with the interposition of one or more means ensuring one or more open passages for the flow of fluid possibly present between the bottom of the bowl and said first face; - profiles or parts of profile having a first plate adapted to be attached to a folded edge of the sheet and a second plate intended to bear, possibly with the interposition of a part or element on a portion of the second face of the layer along its edges; - one or more flexible strips comprising a central structure based on calcium and/or sodium silicate surrounded by a sheath, the one or more flexible strips being arranged between the folded edges of the sheet and the first plates of the profiles or parts of the profile, said one or more flexible strips being arranged to form a substantially continuous coating surrounding the side faces of the layer based on calcium silicate, said strip or strips each having a thickness of 1 to 10 mm for a width advantageously corresponding substantially to the thickness of the layer. - a steel sheet having a minimum thickness of at least 0.5 mm, in particular at least 1 mm, said sheet of substantially rectangular or square shape having four folded edges (10,11,12,13) each having a height of at least 5 mm, in particular from 5 mm to 30 mm, so as to substantially form a bowl with a bottom delimited by the folded edges (10,11,12,13), each of said folded edges advantageously extending in a plane substantially perpendicular to the plane in which said bottom extends; - an advantageously porous calcium silicate-based non-flexible layer with a binder hardened by autoclaving, said layer having a thickness of at least 20 mm, said non-flexible layer defining a substantially parallelepipedic body presenting a first substantially rectangular or square face, a second substantially rectangular or square face opposite said first face, four lateral faces extending between said first and second substantially rectangular or square faces (30,31); the first face of said layer based on calcium silicate bearing on the bottom of the bowl advantageously with the interposition of one or more means ensuring one or more open passages for the flow of fluid possibly present between the bottom of the bowl and said first face; - profiles or parts of profile having a first plate adapted to be attached to a folded edge of the sheet and a second plate intended to bear, possibly with the interposition of a part or element on a portion of the second face of the layer along its edges; - one or more flexible strips comprising a central structure based on calcium and/or sodium silicate surrounded by a sheath, the one or more flexible strips being arranged between the folded edges of the sheet and the first plates of the profiles or parts of the profile, said one or more flexible strips being arranged to form a substantially continuous coating surrounding the side faces of the layer based on calcium silicate, said strip or strips each having a thickness of 1 to 10 mm for a width advantageously corresponding substantially to the thickness of the layer.