Soss 420-US4 Invisible Hinge, Satin Brass

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.

• Invisible Hinge
• Satin Brass
• 4 1/2"H x 3-13/16"W x 1-15/16"D
• Sold Individually