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Minnesota Administrative Rules

4715.2520 VENT STACKS AND STACK VENTS.

Subpart 1.

Vent stack required.

For each sanitary building sewer, at least one three-inch vent stack (or stack vent) carried full size through the roof shall be installed as provided in part 4715.2330. A vent stack or main vent shall be installed with a soil or waste stack whenever individual vents, relief vents, or branch vents are required for stacks of three or more branch intervals.

Subp. 2.

Connections at base and top.

For stacks of three or four branch intervals in height, all main vents or vent stacks shall connect full size at their base to the main soil or waste stack below, through, or not more than 18 inches above the lowest fixture branch.

For stacks of five or more branch intervals in height, a main vent or vent stack shall connect full size with the soil or waste stack it serves, with a wye and one-eighth bend below the lowest fixture branch connected to such soil or waste stack, or at a point approved by the administrative authority.

Each such soil or waste stack, and vent stack shall be similarly cross-connected with a yoke vent at intervals of not more than five branch intervals as described in part 4715.2640.

Subp. 3.

Offsets for stacks of five or more branch intervals or stories.

As provided in part 4715.2360, soil and waste stacks offset at an angle of more than 45 degrees from the vertical, that receive the discharge of fixtures four or more branch intervals or stories above the offset, shall have a yoke vent installed (as per part 4715.2640) at the base of the upper stack section.

Subp. 4.

Vent headers.

Where stack vents and vent stacks are connected into a vent header, such connections shall be made at the tops of the stacks. The vent header shall connect to a vent extension through the roof.

Subp. 5.

Size and lengths of vent stacks.

DIAMETER OF VENT IN INCHES
SIZE
OF
SOIL
OR
WASTE
STACK
IN
INCH-
ES
FIX-
TURE
UNITS
CON-
NECT-
ED
in
d. f. u.
1-1/4 1-1/2 2 2-1/2 3 4 5 6 8 10 12
MAXIMUM DEVELOPED LENGTH OF VENT, IN FEET
1-1/4 2 50
1-1/2 4 40 200
2 9 100 200
2 18 50 150
2-1/2 42 30 100 300
3 72 50 80 400
4 240 40 70 250
4 500 50 180 700
5 540 150 600
5 1100 50 200 700
6 1900 50 200 700
8 2200 150 500
8 3600 60 250 800
10 3800 200 600
10 5600 60 250 800
12 6000 200 600
12 8400 100 300 900
15 10500 50 200 600
15 50000 75 180

Subp. 6.

Size and length of vents; individual, branch, circuit, and header.

Diameter of Vent, in Inches
1-1/4 1-1/2* 2 2-1/2 3 4 5 6
Fixture Units connected in d.f.u. Maximum Developed Length of Vent, in Feet
2 50 ul
4 40 200 ul
8 np 150 250
10 100 200 ul
24 50 150 400 ul
42 30 100 300 500
72 np 50 80 400
240 np 50 200 ul
500 np 180 700 ul
1100 50 200 700

*Except 6 fixture unit fixtures.

ul -- Unlimited length.

np -- Not permitted.

Statutory Authority:

MS s 16B.59 to 16B.75; 326.37 to 326.45; 326B.101 to 326B.194; 326B.43 to 326B.49

History:

23 SR 686; 28 SR 146; L 2007 c 140 art 4 s 61; art 6 s 15; art 13 s 4; L 2008 c 337 s 64; 33 SR 2042

Published Electronically:

May 14, 2012

700 State Office Building, 100 Rev. Dr. Martin Luther King Jr. Blvd., St. Paul, MN 55155 ♦ Phone: (651) 296-2868 ♦ TTY: 1-800-627-3529 ♦ Fax: (651) 296-0569