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// CODE SNIPPET

Section 919 Engineered Vent Systems

Plumbing Code 2018 of Kansas > 9 Vents > 919 Engineered Vent Systems
JUMP TO FULL CODE CHAPTER

919.1 General

Engineered vent systems shall comply with this section and the design, submittal, approval, inspection and testing requirements of Section 316.

919.2 Individual Branch Fixture and Individual Fixture Header Vents

The maximum developed length of individual fixture vents to vent branches and vent headers shall be determined in accordance with Table 919.2 for the minimum pipe diameters at the indicated vent airflow rates.
The individual vent airflow rate shall be determined in accordance with the following:
(Equation 9-1)
For SI:
where:
Nn,b = Number of fixtures per header (or vent branch) ÷ total number of fixtures connected to vent stack.
Qh,b = Vent branch or vent header airflow rate (cfm).
Qv = Total vent stack airflow rate (cfm).
Qv (gpm) = 27.8 rs2/3 (1 — rs) D8/3
Qv (cfm) = 0.134 Qv (gpm)
where:
D = Drainage stack diameter (inches).
Qw = Design discharge load (gpm).
rs = Waste water flow area to total area.
=
Individual vent airflow rates are obtained by equally distributing Qh,b into one-half the total number of fixtures on the branch or header for more than two fixtures; for an odd number of total fixtures, decrease by one; for one fixture, apply the full value of Qh,b.
Individual vent developed length shall be increased by 20 percent of the distance from the vent stack to the fixture vent connection on the vent branch or header.
TABLE 919.2
MINIMUM DIAMETER AND MAXIMUM LENGTH OF INDIVIDUAL BRANCH FIXTURE VENTS AND INDIVIDUAL FIXTURE HEADER VENTS FOR SMOOTH PIPES
DIAMETER OF
VENT PIPE
(inches)
INDIVIDUAL VENT AIRFLOW RATE (cubic feet per minute)
Maximum developed length of vent (feet)
1234567891011121314151617181920
1/295251385432111111111111
3/41008847302015109765433322221
1——1009465483729242017141211987766
11/4———————100877362534640363229262321
11/2———————————1009684756560544945
2———————————————————100
For SI: 1 inch = 25.4 mm, 1 cubic foot per minute = 0.4719 L/s, 1 foot = 304.8 mm.

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