18-29-608.13.2 Reduced pressure principle backflow preventers.

The minimum required air gap shall be measured vertically from the lowest end of a potable water outlet to the flood level rim of the fixture or receptacle into which such potable water outlet discharges.

Reduced pressure principle backflow preventers shall conform to ASSE 1013, AWWA C511 or CSA CAN/CSA-B64.4. These devices shall be permitted to be installed in areas subject to continuous pressure conditions. The relief opening shall discharge by air gap and shall be prevented from being submerged.

18-29-608.13.3 Backflow preventer with intermediate atmospheric vent.

Backflow preventers with intermediate atmospheric vents shall conform to ASSE 1012 or CSA CAN/CSA- B64.3. These devices shall be permitted to be installed in areas subject to continuous pressure conditions. The relief opening shall discharge by air gap and shall be prevented from being submerged.

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