217.4.2 Floor Requirement.
TTYs in public buildings shall be provided in accordance with 217.4.2.1. TTYs in private buildings shall be provided in accordance with 217.4.2.2.
217.4.2.1 Public Buildings.
Where at least one public pay telephone is provided on a floor of a public building, at least one public TTY shall be provided on that floor.
217.4.2.2 Private Buildings.
Where four or more public pay telephones are provided on a floor of a private building, at least one public TTY shall be provided on that floor.
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