There should be a limiter mechanism up near the top, to prevent burglars from just lifting the door up to gain entry.
Look around up at the top for something to be removed from the inside, to lift it up and out.
Careful it is heavy, and costly to replace if you drop it.
ED
Look around up at the top for something to be removed from the inside, to lift it up and out.
Careful it is heavy, and costly to replace if you drop it.
ED