Nonfood-contact surfaces of equipment that are exposed to splash, spillage, or other food soiling or that require frequent cleaning shall be constructed of a corrosion-resistant, nonabsorbent, and smooth material that allows easy cleaning and to facilitate maintenance and free of unnecessary ledges, projections, and crevices to allow for easy cleaning and to facilitate maintenance.
Source:
Section 114130.4, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=114130.4..