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Re: Detached garage with no man door.
I've seen many like those Richard linked to, they work great, attached garages with only the overhead door for access (typically used for golf carts on the houses I inspected).
The ones I saw would allow you to re-insert the keyed lock mechanism (giving the cable to the emergency release device slack), then you could reset the emergency release lever to automatically engage when the door closed.
That way, you could close the door from the outside and it would lock back into the opener traveler and lock the door closed.
However, they would not do any good if the door opener track itself or if the traveler itself broke - guess you would be stuck in there then.
Of course, though, those are to allow access into that space, you are referring to getting out once in and the door is closed, right?
I always suggested to my clients that they have a door operator button installed on the wall inside those garages in case they were in there and someone else (like a spouse) closed the door without knowing they were in there, they did not have the remote with them.
That would not solve the problem with the power out, but you would be in the garage and could then pull the emergency release cable to raise the door - provided the springs were tensioned properly to balance the door.
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