Whether your doorway is made of wood or metal, rated 20 minutes or 3 hours, there is a Soss fire rated hinge that will comply and still give you the invisible look you expect from Soss.
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No issues. On time, in good condition.
Quick and easy. Price was satisfactory and shipping was prompt.
I received telephone assistance before I ordered. The parts arrived promptly. I highly recommend them to experienced do-it-yourselfers or those just learning.