What is the standard size for a tub shower door?

What is the standard size for a tub shower door?
The standard shower door size is between 22-inches and 36-inches. A shower opening wider than 36-inches will likely need an additional door panel or a type of shower door designed for wide openings. Tip: It's also important to know the "handedness" of the door. An easy way to do this is to simply open the door.

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