To limit the probability that shower facilities will not be provided for a person using a manual wheelchair or other manual mobility assistance device, which could lead to the person being denied access in situations in which regulations call for persons to shower, such as swimming pools, saunas, water parks, whirlpools, etc.
To supersede the requirement for a minimum width of 920 mm stated in Sentence 3.8.1.3.(1) and require a greater minimum width, on the basis that shower enclosures need to be wider to allow for proper usage by a person using a manual wheelchair or other manual mobility assistance device.