Bifold slide guides

A quick learner says:
When would I need a slide guide on a steel bifold door? And does it mater if it is a single or double bifold?
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Emily from SWISCO responded:

Thanks for reaching out to us. It's not technically an essential part but it does help cushion the door when opening it. Do you think your door needs cushioning?

Bi-fold Door Repairs
Bi-fold Door Repairs
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