Fire Rated Door Stop Size

20 gage door constructions are approved for smaller door sizes than what is shown above.
Fire rated door stop size. How thick should my fire door frame or lining be. Fire ratings for doors are influenced by but not limited to the following items. Door stops which assist the door in latching can be cut out of the solid frame a rebate is produced to form a stop for the door or planted. In addition heavy fire doors may drop by a millimetre or 2 over time and so tight fitting doors will stop closing and need to be adjusted.
Maximum doors size for fire ratings is influenced by but not limited to the following items. A note of warning hang the door first then fix the stops not the other way round. The planted section should be fixed by pinning or gluing and pinning the stop to the frame. Steel gage of the door example.
Fire doors were tested early seventies to bs 476 part 8 and the frame door stops was 1 inch 25mm with no intumescent seal. This could be achieved by fixing an addition 1 2 inch 12mm glued and screwed to the existing door stop. A fire door is a door with a fire resistance rating sometimes referred to as a fire protection rating for closures used as part of a passive fire protection system to reduce the spread of fire and smoke between separate compartments of a structure and to enable safe egress from a building or structure or ship.