§ 46.822. Design, construction and installation of plumbing systems.

 (a)  Approved system and cleanable fixtures.

   (1)  A plumbing system shall be designed, constructed and installed according to Chapter 3 of the Pennsylvania Construction Code Act (35 P. S. § §  7210.301—7210.304).

   (2)  A plumbing fixture such as a handwashing facility, toilet or urinal shall be easily cleanable.

 (b)  Handwashing facility: installation.

   (1)  A handwashing sink shall be equipped to provide water at a temperature of at least 38°C (100°F) through a mixing valve or combination faucet.

   (2)  A steam mixing valve may not be used at a handwashing sink.

   (3)  A self-closing, slow-closing or metering faucet shall provide a flow of water for at least 15 seconds without the need to reactivate the faucet.

   (4)  An automatic handwashing facility shall be installed in accordance with manufacturer’s instructions.

 (c)  Air gap requirement for backflow prevention. An air gap between the water supply inlet and the flood level rim of the plumbing fixture, equipment or nonfood equipment shall be at least twice the diameter of the water supply inlet and may not be less than 25 mm (1 inch).

 (d)  Design standard for backflow prevention device. A backflow or backsiphonage prevention device installed on a water supply system shall meet American Society of Sanitary Engineering standards for construction, installation, maintenance, inspection and testing for that specific application and type of device.

 (e)  Design of conditioning device. A water filter, screen and other water conditioning device installed on water lines shall be designed to facilitate disassembly for periodic servicing and cleaning. A water filter element shall be of the replaceable type.

   This section cited in 7 Pa. Code §  46.131 (relating to cleanliness of hands and exposed protions of arms); and 7 Pa. Code §  46.823 (relating to numbers and capacities of plumbing facilities).