We have found that vertical blinds are always broken. The parts are delicate and will break with very little stress. Particularly bad for door ways (sliders).
Bali (Home Depot & Lowes) has a panel slider that telescopes to one side. Have used on 8 foot sliders with good success. Simpler to open and much more durable.
Also like and have used the Hunter Douglas type. Various options, simple manual raise. Can also do power. Cost is always a factor. For a long span will likely require two, leaving some gap in middle. These have had the best reliability for us.
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