Facilities with more than 50 beds that provide common use bathing facilities shall provide at least one roll-in shower with a seat that complies with 608. Transfer-type showers are not permitted in lieu of a roll-in shower with a seat, and the exceptions in 608.3 and 608.4 for residential dwelling units are not permitted. When separate shower facilities are provided for men and for women, at least one roll-in shower shall be provided for each sex.