Hyphens, En Dashes, Em Dashes
Q. It seems that all types of dashes are treated without spaces in Chicago. Is the use of a hyphen with spaces ever acceptable (word - word)?
A. Chicago style omits spaces around hyphens, en dashes, and em dashes. There are exceptions where a single space is allowed after a hyphen or en dash:
left- and right-hand margins
nos. 1– (1980–)
Some kinds of writing (such as in some other languages, or in poetry) follow their own rules, but Chicago style never calls for spaces on both sides of a hyphen.