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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They are fabulous people.
I've been looking for replacement hinges for my kitchen cabinets for two years. I sent Doug 5-6 different pictures of my hinges and he pick out one that worked perfectly in just a few hours. Great service and expertize!!
Great product. Found hinges here that no one else carried.