A small add-on to garage is concrete block with one door. The old door
is hollow core and falling apart. The frame is steel with no apparent
screws or fasteners showing. The frame has coats of old paint and a
little rust and I can't imagine how one would remove the steel frame.
Rather than replacing just the door, it is looking like it would be
easier, if we can remove the whole thing and replace with a pre-hung
door. Door is 32x80, 1 5/8".