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there are 2 obvious things you need to make sure of when you install:
make sure that the track is level
make sure that the track is perpendicular to the door
but if this is just a swap out that shouldn't be an issue.
as to power outages: there is a cord with a red handle on mine that decouples the door from the track which allows you to manually raise and lower the door.
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Veritas Principium Libertas
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