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STUDOR ® AUSTRALIA Presents. STUDOR ® A ir A dmittance V alves Module 2 Group and Stack Venting. ©MTW Studor Aust. Oct 2004. Preface:.

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STUDOR® Air Admittance Valves

Module 2

Group and Stack Venting

©MTW Studor Aust. Oct 2004

Preface l.jpg

  • This presentation is intended to provide the participants with the most current information available at time of publication and draws on Australian National Standards AN/NZS3500.2.2003.

  • This presentation is at best, a guide, and it is always the installers responsibility to confirm the local regulations, variations and options that apply in their state and/or area.

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This Course:

should at its completion, enable the participants to:

1.correctly identify the components of the Mini-Vent and Maxi-Vent Air Admittance Valve (AAV)

2.correctly install both in Group Venting and Stack Venting applications

The Assessment:

will be via a written Question & Answer Sheet at the end of the course

(Participants are advised to make note of items marked with a ‘*’)

Introduction l.jpg

  • It is assumed that the participants in this course have completed the first module of this course or have at least practical experience with the installation and application of Air Admittance Valves as single fixture vents.

  • In this module we will learn their applications as Group and Stack Vents.

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  • * Studor Mini-Vent & Maxi-Vent Air Admittance Valvescan be used for venting groups of fixtures such as domestic bathrooms and en-suites up to commercial washrooms, toilet blocks etc

    This is : “Group Venting”

  • *The Mini-Vent and Maxi-Vent can also vent the vertical pipes or stacks that connect these groups of fixtures on various floors in multi-storey applications These pipes can vary in size from 50mm to 200mm:

    This is “Stack Venting”

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The Valves



Airflow of7.5 litres/second at -250 Pa


*60 Fixture units for Group Venting

*6 Fixture units for Stack Venting

Airflow of 32 litres/second at -250 Pa


*1000 Fixture units for Group Venting

*140 Fixture units for Stack Venting

Both Valves have a lifetime warranty

Both conform to AN/NZS4936 Australian Manufacturing Standard

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Important Note

*.Always ensure when installing anyAAVthat it is an Australian Standards approved product and has both approval and airflow capacity(l/s) clearly marked on the body of the valve or packaging

On the top of the Mini-Vent and Maxi-Vent are the relevant Australian Standards Marking

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  • Are guaranteed for the life of the plumbing system to which they are attached!

  • Every Mini-Vent and Maxi-Vent has been tested twice before dispatch from the factory!

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The STUDOR Mini-Vent & Maxi-Vent

Both AAV’s share a common form of packaging







Installation l.jpg

The Mini-Vent as supplied can beinstalled on 3 different sizes of PVC DWV pipes:

  • *40mm:to suit basins, small sinks and baths in Australia

  • *50mm: to suit sinks,laundry tubs etc

  • *32mm: Older plumbing systems inAustralia (and basins etc in NewZealand)

    *The Mini-Vent can be installed up 1000mm(1 metre) below the rim/flood level of the highest fixture of the group it is venting

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  • Note:

    The capacity of the Mini-Vent is not limited by the pipe size it is connected to but the total number of fixture units it is venting.

    i.e.: a Mini-Vent can be installed (via reducers etc.) on a 80mm (or above) DWV Waste Pipe if the total number of fixture units doesn’t exceed 60 F.U.

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The Maxi-Vent as supplied can beinstalled on 2 different sizes of PVC DWV pipes:

  • *80mm

  • *100mm

    *When used as a group vent the Maxi-Vent can also be installed up to 1000mm(1 metre) below the rim/flood level of the highestfixture in the group it is venting

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Group Venting

This plumbing ventilation test rig, the biggest in the world, was built by students and staff at Gymea TAFE in Sydney, to prove AAVs were equal to or better than ‘Open Air Venting’ for groups of fixtures

This entire rig was vented by just 2


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AN/NZS 3500.2.2003


6.9.1 Air admittance valves

Air admittance valves complying with AS/NZS 4936 may be used in sanitary plumbing systems for *trap vents, group vents and stack vents and to ventilate branch drains*. They shall not be used for the upstream venting of a main drain.

NOTE: Branches connected into a positive pressure area, such as near boundary traps in multi storey buildings, may need additional venting.

6.9.2 Requirements for use

The following apply:

(a) Air admittance valves shall be used only on *systems that have at least one open upstream vent off the main drain. The upstream vent shall be sized in accordance with Table 3.5 and shall be not less than DN 50.

(b) Where more than one building on an allotment drains to the sewerage system, the sanitary drainage system of each building shall have one open upstream vent connected to its sanitary drain

(c) Air admittance valves shall have a determined airflow capacity not less than that in Table 6.6 when used as a trap vent, group vent or branch drain upstream vent, and Table 6.7 when used as a stack vent

.(d) An air admittance valve shall not be used as a stack vent where the stack extends through 10 or more floor levels.

(e) Where a sanitary plumbing system has a relief vent fitted to the stack, the relief vent shall be extended separately to atmosphere as an open vent.

(f) In Australia, air admittance valves that form an integral part of a fixture trap shall only be used as a trap vent

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Group Venting (Installation)



Here we see two options;

*1. Coming off the 100 x 50 vented Pan bend, (probably the last fixture in the group)

*2. Coming off a 100 x 50 Junction on the common discharge pipe

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Group Venting

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Venting Diagram

Relief Vent to atmosphere

* Common Discharge pipes

Clause 7.5.3 and

Alternative Position

Clause (b)


Clause 7.5.3.

Clause 2

*Refer to Australian National Standards AS/NZS3500.2.2003

*Please note:Although group vents have been deleted, the relief vent is still required on the stack to maintain air flow and equalize pressures within the stack

  • The relief vent should also be extended to atmosphere when the stack is vented with a Maxi-Vent. (although in Aust. states with a Performance Code option, Studor advises that this is deleted)

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Group Venting

  • So , knowing that we have to use the Table 6.6 to correctly size our AAV, we now add up the number of fixture units in our group and check the table.

  • Let’s assume we have 6 W.C.’s (Pan/Cistern combinations)

  • i.e. 1 x W.C.= 4 Fixture Units

  • 4F.U.X 6 = 24 Fixture Units

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Table 6.6

Minimum Determined Airflow Capacity of Air Admittance Valves When used as a Trap or Group Vent

Fixture Unit loading of discharge pipe













Min. Airflow capacity of AAV’s

(litres per second)













The maximum capacity:

STUDOR® Mini-Vent™ 7.50 l/s (or 60 FU)

STUDOR® Maxi-Vent™ 32.01 l/s (or 1000 FU)

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Stack Venting

  • The same rule also applies to Stack Venting.

  • Lets assume 6 x W.C.’s on one common discharge pipe and 6 washbasins on the opposite one and we have the same on 2 floors of a multi storey building.

  • 6 x 4 F.U.(24FU)

    + 6 x 1 F.U.(Washbasins)(6FU) = 30 FU

    X 2 Floors

    = 60FU

    Let’s check the next table………..

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Fixture unit loading of discharge Minimum determined air flow

stack capacity of AAV, Litres per second

1 3

2 4

4 6

6 7

10 9

12 10

15 11

20 13

25 15

30 16

40 18

60 23

80 26

100 29

200 41

300 51

400 58

500 65

600 72


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Stack Venting


With adapter

Push-fit into 100mm DWV

pipe with adapter

Removal of adapter enables

solvent welding to 80mm DWV

Adapter allows push-fit over 80mm DWV pipe

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Stack Venting

No need to penetrate the roof!

When a Maxi-Vent is installed in a roof space, always allow at least 150mm above any insulation

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Stack Venting

When installing the Maxi-Vent in areas that might be subject to temperatures below 0ْ or above 60ْ, use the top half of the foam packaging for thermal protection ْ

For additional physical protection, where the valve is installed externally, an aluminum cap is available as an cover over the foam packaging.

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The Maxi-Vent™

The Mini-Vent™


Traditionally Vented plumbing system

A stack and group vented plumbing system using Studor AAV’s

Note the saving of unnecessary vent piping/fire collars etc and no roof penetration required

*Although not shown here, each plumbing system/building/house etc must have at least one open vent to atmosphere.

In some cases this may need to be the main stack, so a Maxi-vent might not be used.

Mini-Vents would still be used however for venting single fixtures and bathroom groups

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  • We’ve learned that approved AAVs can be used to vent both groups of fixtures and the stacks usually connected to those groups as well as how to correctly size and install them in those situations.

  • Please clarify any points with your instructor on which you are unsure

  • Your Instructor will now hand out a Q & A sheet for you to complete.


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STUDORAustralia would like to thank:

- the Teaching and Stores Staff under the guidance of Raymond Jones, Senior Head Teacher of Plumbing,TAFE NSW Southern Sydney Institute, Sutherland College (Gymea Campus)

for their support and contribution to this entire course.

- All TAFE teachersnationally

STUDOR would also like to acknowledge the continued support offered by Plumbers Supplies Co-operative who provided the materials for this project