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Discuss No mains present... alternatives...? in the UK Electrical Forum area at ElectriciansForums.net
We had three of those around 15' high and 12'wide, never a bit of trouble in over 20years , and still in good order when the building was sold.A roller shutter door, with a decent flywheel, operated by an endless chain, will open and shut with no effort and as fast as an electric door.
The only advantage that I've found with electric ones, is that you can push the remote fob from fifty yards away, and the door's fully open by the time you reach it.
Reply to No mains present... alternatives...? in the UK Electrical Forum area at ElectriciansForums.net