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Steve - not sure if you are referring to the roller door or the panel lift door opener?
I've got a Glyderol panel lift door with opener - a bit like the BOL4 in your link however it has a long threaded rod that rotates rather than a chain. It has been installed for 9 years and has never been a problem mechanically however the vibration causes the internal lights to fail frequently and the rotating rod mechanism is really noisy. I've seen the chain variety working and they seemed much quieter.
Peter
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