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SOSS now offers a complete line of firerated invisible hinges. Whatever the door or opening, there is a SOSS hinge for you. Whether your doorway is made of wood or metal, rated 20 minutes or 3 hours, there now is a SOSS fire-rated hinge that will comply and still give you the “uniquely invisible” hinge that you expect from SOSS.
Minimum Door Thickness: 2"
180 minute UL Fire Rated Hinge for Metal Doors. The SOSS Invisible #420 Hinge is specifically designed with square edges for metal doors. The Underwriters Laboratories labeled #420 SOSS Invisible Hinge can be used on hollow metal, sheet metal, tin clad and steel composite swinging type fire doors and frames rated up to and including 3 hours.
Additionally, they can be used on wood core doors and frames rated up to 20 minutes. Use at least one fire-rated hinge for every 20" of door height or portion thereof, or one hinge for every 60 lbs. or fraction thereof, whichever calculation demands more hinges. They are not to be used on a door that normally is held open.