Fastening assembly of a fire door to a bulkhead

A fastening assembly of a fire door to a bulkhead, said bulkhead comprising a first side surface and a second side surface opposite to the first side surface;

• said assembly comprising:
• a shaped frame, which the door is hinged to, the shaped frame includes:
• a first bracket, at least partly facing the first side surface of said bulkhead;
• and
• at least one primary flange, mechanically connected to said first bracket;
• a subframe comprising:
• a second bracket, parallel to the first bracket and facing the second side surface of said bulkhead;
• and
• at least one secondary flange mechanically connected to said second bracket;
• at least one joint, able to tighten the frame to the subframe to retain the bulkhead between said mutually facing first and second brackets;
• wherein:
• the at least one joint connects the at least one primary flange with the at least one secondary flange, avoiding engaging at the same time the portion of the first bracket facing the first side surface and the portion of the second bracket facing the second side surface, and avoiding directly engaging the bulkhead, the at least one joint being oriented along an axis parallel to said first and second brackets.