- a) A reduced pressure principle backflow preventer assembly conforming to ASSE 1013, or a fixed air gap, shall be installed on each dental unit or group of dental units.
- b) Dental vacuum systems connected to the water supply shall be provided with backflow protection.
- c) If a dental unit has a water outlet below the flood rim level of a cuspidor, then an approved reduced pressure principle backflow preventer assembly, a fixed air gap, an air vent hole on the outlet, or an approved vacuum breaker shall protect the water supply from each dental unit.
(Source: Amended at 38 Ill. Reg. 9940, effective April 24, 2014)