P2902.3.1 Air Gaps
Air gaps shall comply with ASME A112.1.2 and air gap fittings shall comply with ASME A112.1.3. An air gap shall be measured vertically from the lowest end of a water outlet to the flood level rim of the fixture or receptor into which the water outlets discharges to the floor. The required air gap shall be not less than twice the diameter of the effective opening of the outlet and not less than the values specified in Table P2902.3.1.
MINIMUM AIR GAPS
|FIXTURE||MINIMUM AIR GAP|
|Away from a walla |
|Close to a wall|
|Effective openings greater than 1 inch||Two times the diameter of the||Three times the diameter of the|
|Lavatories and other fixtures with effective opening not|
greater than 1/2 inch in diameter
|Over-rim bath fillers and other fixtures with effective|
openings not greater than 1 inch in diameter
|Sink, laundry trays, gooseneck back faucets and other fix|
tures with effective openings not greater than 3/4 inch indiameter
For SI: 1 inch = 25.4 mm.