You already know a carriage door is not a standard 3'0 x 7'0 passage leaf. It is wider, heavier, usually swings on an exterior wall, and it carries a look the owner paid a premium for. So the hinge decision...
A prehung door shows up with its hinges already set, and that setting rarely matches the leaf weight, swing, or code line your opening actually has. When it's off, the door slams or hangs shy of the strike, and fixed...
On an ADA opening, two hinges that sit one line apart on a hardware schedule can give you very different inspection results. The whole difference shows up in three numbers you already track: clear width, maneuvering clearance, and opening force....
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