CHAPTER I: DEPARTMENT OF PUBLIC HEALTH
SUBCHAPTER r: WATER AND SEWAGE
PART 890 ILLINOIS PLUMBING CODE
SECTION 890.APPENDIX A PLUMBING MATERIALS, EQUIPMENT, USE RESTRICTIONS AND APPLICABLE STANDARDS
Section 890.APPENDIX A Plumbing Materials, Equipment, Use Restrictions and Applicable Standards
Section 890.TABLE C Minimum Air Gaps for Plumbing Fixtures
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Minimum Air Gap (Inches) |
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When Not Affected by Near Wall1 |
When Affected by Near Wall2 |
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Lavoratories and other fixtures with effective opening not greater than ½ inch diameter. |
1 |
1½ |
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Drinking water fountains, single orifice not greater than 7/16 (0.437) inch diameter or multiple orifices having total area of 0.150 square inches (area of circle 7/16 inch diameter). |
1 |
1½ |
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Sink, laundry trays, goose neck bath faucets and other fixtures with effective opening not greater than one inch diameter. |
1½ |
2¼ |
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Stills, sterilizers and other appliances, fixtures, devices and water and waste connections used for preparation of sterile material. |
2 |
3 |
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Over rim bath fillers and other fixtures with effective openings not greater than one inch diameter. |
2 |
3 |
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Effective openings greater than one inch. |
2 X Diameter of effective opening |
3 X Diameter of effective opening |
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1 Side walls, ribs or other similar obstructions do not affect air gaps when spaced from inside edge of spout opening a distance greater than three times the diameter of the effective opening for a single wall, or a distance greater than four times the diameter of the effective opening for two intersecting walls. |
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2 Vertical walls, ribs or similar obstructions extending from the water surface or to above the horizontal plane of the spout opening require a greater air gap when spaced closer to the nearest inside edge of spout opening than specified in Footnote 1 above. The effect of three or more such vertical walls or ribs has not been determined. In such cases, the air gap shall be measured from the top of the wall. |
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