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Illinois Administrative Code (Last Updated: March 27, 2024) |
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TITLE77. PUBLIC HEALTH |
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PART890. ILLINOIS PLUMBING CODE |
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SUBPARTM. INSPECTIONS, TESTS, MAINTENANCE AND ADMINISTRATION |
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Section890.APPENDIX A. Plumbing Materials, Equipment, Use Restrictions and Applicable Standards |
§890.TABLE H. Horizontal Fixture Branches and Stacks
Latest version.
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Maximum Number of Drainage Fixture Units (D.F.U.)
That May be Connected to:
More than 3 Stories in Height
Diameter of Pipe (inches)
Any Horizontal Fixture Branch
One Stack of 3 Stories in Height or 3 Intervals
Total for Stack
Total at One Story or Branch Interval
1¼
1
2
2
1
1½
3
4
8
2
2
6
10
24
6
2½
12
20
42
9
3
201
302
602
161
4
100
240
500
90
5
360
540
1,100
200
6
620
960
1,900
350
8
1,400
2,200
3,600
600
10
2,500
3,800
5,600
1,500
12
3,900
6,000
8,400
1,500
15
7,000
−
−
−
1 Not over two water closets.
2 Not over six water closets, or more than two per branch interval or per floor.