Louisiana Administrative Code
Title 51 - PUBLIC HEALTH-SANITARY CODE
Part XIV - Plumbing
Chapter 9 - Vents
Section XIV-925 - Battery Venting

Universal Citation: LA Admin Code XIV-925

Current through Register Vol. 50, No. 9, September 20, 2024

A. A branch soil or waste pipe of uniform diameter throughout its length, to which are connected in battery a maximum of eight floor-level fixtures [floor outlet water closets, back outlet water closets (provided they connect horizontally into the battery vented section), floor drains, bathtubs, and showers] and which do not exceed 50 percent of the fixture units allowed by column two of Table 725.A.2 of this code, may be vented by a circuit or loop vent system connected downstream of the most upstream fixture drain (between the two uppermost fixture drains). In addition, battery vented branches on the top floor of a building and serving three or more fixtures shall be provided with a relief vent connected immediately downstream of the first downstream fixture connection of the battery vented section. When a battery vented branch is installed below the uppermost floor of the building, regardless of the number of fixtures served, it shall be provided with a relief vent connected immediately downstream of the first downstream fixture connection of the battery vented section. When lavatories or similar fixtures having a fixture unit rating of four or less and a maximum 2-inch fixture drain discharge from above such branches, each vertical branch shall be provided with a continuous vent. Such fixtures shall be located on the same floor as the battery vented group and the waste from such fixtures is required to enter the battery vented section from the horizontal. Fixtures having fixture unit ratings greater than four shall not discharge into such branch from above unless all fixtures in the battery group are individually vented. Fixtures from an upper floor or from an adjoining or other room(s) or space(s) (other than back-to-back installations, for example, back-to-back to bathrooms) shall not discharge into a battery vented branch. Floor level fixtures, including but not limited to floor drains, discharging downstream from a water closet shall be individually vented (see §925. C.5 of this code). Each fixture drain/trap which is connected to a battery vented soil or waste pipe branch shall conform with the distance of trap from vent requirements in Table 913.A of this code. The developed length distance from the weir of the trap or the flange of the water closet to the battery vented soil or waste pipe branch shall be used to determine compliance with Table 913.A of this code.

1. Exception. The relief vent, connected immediately downstream of the first downstream fixture connection of the battery vented section, may be omitted on a top floor installation of a battery vented section provided a stack vent or vent stack is located downstream of the first downstream horizontal fixture connection.

B. Vent Connections. Any vent or vents on the battery vented section shall be taken off from the vertical or at an angle not exceeding 45 degrees from the vertical in conformity with § 909. B.1 of this code.

1. In addition, if a fixture having a fixture unit rating of four or less and a maximum 2-inch fixture drain discharge wastes into either the upper vent or the downstream relief vent of a battery vented section, the wet portion of such vent shall not be smaller than the horizontal battery branch.
a. Exception. The vent branch connection may be taken off horizontally provided it is washed by not more than four fixture units, other than water closets, and the wet portion of the vent is not smaller than the horizontal battery branch.

C. Fixtures Back-to-Back in Battery (see Figure 925.C of this code). Fixtures installed back-to-back in a battery vented system shall comply with the following.

1. A fixture connected to a horizontal branch through a vertical drain and a sanitary tee shall be vented in accordance with §913. A of this code.

2. Back-to-back fixtures connected to a horizontal branch through a single vertical drain shall enter the vertical drain through a sanitary cross, and a common vent for each two fixtures shall be provided. The common vent shall be installed as a continuation of the vertical drain.

3. A fixture connected to a horizontal branch through a wye or combination wye and one-eighth bend installed in a horizontal position need not be individually vented.

4. Back-to-back fixtures connected to a horizontal branch through a double wye or combination double wye and one-eighth bend installed in the horizontal position need not be provided with a common vent at the connection to the horizontal branch, except for the last two fixtures upstream. The vent shall be installed in a vertical position at the interconnection of the fixture drains or downstream of the interconnection in accordance with the distance of fixture trap from vent requirements in Table 913.A of this code.

5. In spite of §925. C.3 of this code, the following floor level fixtures discharging downstream from a water closet shall be individually vented:
a. floor drains;

b. bathtubs;

c. showers;

d. floor sinks;

e. curbed cleaning facilities (i.e., floor-level mop sinks); and,

f. similar type fixtures.

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Figure 925.C - Battery Venting

AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(7) and R.S. 40:5(2)(3)(7)(9)(16)(17)(20).

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