Fume extractor hood of the type that can be at least partially inserted into a seat formed in a ceiling , said ceiling having an outer surface and an inner surface at least partially defining said seat and opposite to the outer surface , said hood comprising: - a frame having at least one pair of opposite sides , said frame being configured to be at least partially inserted into said seat ; - at least one locking element arranged at one of said sides of said frame , said locking element comprising an extendable portion commutable between an extended configuration, in which it rests on said inner surface to retain said frame in said seat , and a retracted configuration, in which it is brought back inside a perimeter of said frame to allow the engagement and disengagement of said frame into/from said seat , said locking element comprising at least one elastic element associated with said extendable portion to push it from the retracted configuration to the extended configuration; said locking element comprises a gripping member connected to said extendable portion and being accessible when said frame is inserted into said seat , said gripping member being operable to bring back said extendable portion from the extended configuration to the retracted configuration; characterized in that said locking element comprises: - a rod having a first end connected to said extendable portion and a second end opposite to the first end , said gripping member being defined on said second end ; - an arm , which is rotatably connected to said extendable portion to rotate with respect to said extendable portion , a guide formed on said arm , said first end of said rod being engaged in said guide for sliding along said guide ; - a pin connecting said rod and said guide , said arm being rotatably connected to said rod through said pin . - a frame having at least one pair of opposite sides , said frame being configured to be at least partially inserted into said seat ; - at least one locking element arranged at one of said sides of said frame , said locking element comprising an extendable portion commutable between an extended configuration, in which it rests on said inner surface to retain said frame in said seat , and a retracted configuration, in which it is brought back inside a perimeter of said frame to allow the engagement and disengagement of said frame into/from said seat , said locking element comprising at least one elastic element associated with said extendable portion to push it from the retracted configuration to the extended configuration; said locking element comprises a gripping member connected to said extendable portion and being accessible when said frame is inserted into said seat , said gripping member being operable to bring back said extendable portion from the extended configuration to the retracted configuration; characterized in that said locking element comprises: - a rod having a first end connected to said extendable portion and a second end opposite to the first end , said gripping member being defined on said second end ; - an arm , which is rotatably connected to said extendable portion to rotate with respect to said extendable portion , a guide formed on said arm , said first end of said rod being engaged in said guide for sliding along said guide ; - a pin connecting said rod and said guide , said arm being rotatably connected to said rod through said pin . - a rod having a first end connected to said extendable portion and a second end opposite to the first end , said gripping member being defined on said second end ; - an arm , which is rotatably connected to said extendable portion to rotate with respect to said extendable portion , a guide formed on said arm , said first end of said rod being engaged in said guide for sliding along said guide ; - a pin connecting said rod and said guide , said arm being rotatably connected to said rod through said pin . <EOS>