Ill. Admin. Code tit. 77, 890, Subpart M, Appendix A K

Current through Register Vol. 48, No. 25, June 21, 2024

Table K - Size and Length of Vents

Size of Soil or Waste Stack	Fixture Units Connected	Diameter of Vent Required (Inches)
		11/4	11/2	2	21/2	3	4	5	6	8
		Maximum Length of Vent (Feet)
11/4	2	30
11/2	8	50	150
11/2	10	30	100
2	12	30	75	200
2	20	26	50	150
21/2	42	30	100	300
3	10	30	100	200	600
3	30	60	200	500
3	60	50	60	400
4	100	35	100	260	1,000
4	200	30	90	250	900
4	500	20	70	180	700
5	200	35	80	350	1,000
5	500	30	70	300	900
5	1,100	20	50	200	700
6	350	25	50	200	400	1,300
6	620	15	30	125	300	1,100
6	960	24	100	250	1,000
6	1,900	20	70	200	700
8	600	50	150	500	1,300
8	1,400	40	100	400	1,200
8	2,200	30	80	350	1,100
9	3,600	25	60	250	800
10	1,000	75	125	1,000
10	2,500	50	100	500
10	3,800	30	80	350
10	5,600	25	60	250

Ill. Admin. Code tit. 77, 890, Subpart M, Appendix A K

Agency Note: Per Section 890.1580(e), no more than 20 percent of the maximum developed length may be installed in the horizontal position. Vent piping serving floor drains shall be installed in such a manner as to minimize horizontal vent distances.