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.
#418 The Underwriters Laboratories labeled #418 SOSS Invisible Hinges 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. They also can be used on wood core doors and frames rated up to 20 minutes.
Additionally, they can be used on wood/ plastic composite doors and frames constructed with Georgia Pacific FSM-1 or FSM-2 banding for a rating up to and including 90 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. The #418 SOSS hinge is for use on 90 minute wood faced doors constructed to Georgia Pacific specifications utilizing 2" No. 10 screws; the hinge style must be a minimum of 2-3/16" wide. This may be made up from two pieces of 1" firestop and 3/16" of wood.
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