Vent shaft cowls

With decades of experience in sewer ventilation, SVSR designs, fabricates and installs high quality sewer vent shaft cowls for diverse projects. Our market leading designs are high quality and fit for purpose. We provide outstanding sewer vent line solutions for Sydney Water, regional councils, engineering projects, pump stations and major commercial clients.

High quality, compliant sewer vent shaft cowls


SVSR is the expert in wastewater infrastructure. We manufacture sewer vent cowls to specification, and we develop innovative solutions for challenging projects.

We offer vent cowls in all sizes from DN150 to DN225/DN250 and DN300. Our induct and educt cowls are fitted with stainless steel shafts and sealed stainless steel bearings to minimise damage from highly corrosive sewer gases. The added benefit for you is that this also minimises maintenance costs.

“The quality is good and there were no issues through the project. When we’re looking for induct vent cowls again, we’ll certainly get in touch with Chris. He and his team did a great job.” ~ Peter Bainbrigge, Director, Professional Pump Services & Irrigation (PPS&I)

Educt cowls


Educt sewer vent cowls can have custom sleeves fitted, depending on the vent shaft ID requirement.

Wire sewer vent cowls (passive)

In cases where access for ongoing maintenance is limited, for example in a residential backyard, the best option is a wire vent pipe cowl. Also known as a bird cage, this type of sewer vent cowl is passive and non-directional, requiring minimal maintenance.

Wire Vent Cowls

We manufacture our wire vent shafts cowls to the following specifications:

  • Material: Stainless steel
  • Finish: Primed and painted in your choice of colour
  • Dimensions: Available in sizes 150mm, 225mm and 300mm
  • Spot welded at all intersections
  • Weight: 5kgs
  • Dimensions:
    • Model 150 weight 1.9kg, inner 150mm, outer 580mm
    • Model 225 weight 2.8kg, inner 235mm, outer 725mm
    • Model 300 weight 3.7kg, inner 308mm, outer 850mm
  • Tolerances: size +/- 2mm, weight +/- 0.2kg
  • Sydney Water Drawing No. DTC-2301 and EPS 700.12 1.

Rotating educt sewer vent cowls (active)

In order to maximise the extraction of corrosive and odorous gases from sewer lines and maintenance holes, rotating sewer vent cowls create a vacuum through their ‘whirly bird’ design.

These are active cowls designed for areas where septicity and odour issues are common e.g. pump station wet wells and rising main discharge maintenance holes. They feature UV stability to withstand the elements.

SVSR rotating educt vent pipe cowls are manufactured to the following specifications:

Rotating educt vent cowls (active)
  • Materials: Turbine & flue – aluminium grade 5005 H34
  • Bearings: Steel NSK BFW30 bearing deflector flange -aluminium grade
  • Rivets: Stainless steel STST grade 302
  • Screws & nuts: 316 stainless steel
  • Shafts & brackets: 316 stainless steel
  • Bearing Holder: Glass filled nylon
  • Finish: Powder coated inside & out with polyester powder
  • Weight: 5kgs
  • Dimensions:
    • Model 150 weight 1.9kg, inner 150mm, outer 580mm
    • Model 225 weight 2.8kg, inner 235mm, outer 725mm
    • Model 300 weight 3.7kg, inner 308mm, outer 850mm
  • Tolerances: size +/- 2mm, weight +/- 0.2kg
  • Sydney Water Drawing No. EPS 700.111

Induct cowls


Induct sewer vent cowls can accommodate a PVC vent line coupling or a Table D flange, depending on site requirements.

Vent shaft mounted rotating induct cowl (active)

This type of sewer vent cowl is fitted with a wind vane to the rear that ensures the cowl spins to face the direction of the wind, forcing wind into the vent. It works by drawing oxygen into the sewer, increasing air-flow, thereby reducing septicity, corrosion and concrete cancer.

Like an educt cowl, it has UV stability to withstand the elements.

Varying sizes of Rotating Induct Cowls

Rotating induct sewer vent shaft cowl specifications:

  • Materials: Bearing deflector flange – aluminium grade
  • Rivets: Stainless steel STST grade
  • Screws & nuts: 316 stainless steel
  • Shafts & brackets: 316 stainless steel
  • Bearing holder: Glass filled nylon
  • Finish: Powder coated inside and out with polyester powder
  • Weight: 5kgs
  • Dimensions:
    • Model 150 weight 1.9kg, inner 150mm, outer 580mm
    • Model 225 weight 2.8kg, inner 235mm, outer 725mm
    • Model 300 weight 3.7kg, inner 308mm, outer 850mm
  • Tolerances: size +/- 2mm, weight +/- 0.2kg
  • Sydney Water Drawing No. EPS 700.111

Custom design sewer vent cowls


We know that no two jobs are the same. Often, to get the job done, you need innovative thinking. We prioritise research and development to stay ahead of customer needs.

We take this approach with our sewer gas vent cowls. We collaborate with your engineers on custom designs that are industry compliant – and highly efficient.

Our team focuses on customer needs. Our sewer vent solutions are best practice. Our capability is second to none.

Whatever your needs for sewer air vent cowls, sewer vents or odour filters, our team has the expertise to deliver. Contact us to discuss your project.

News & Projects


A guide to vent cowls

As leading vent shaft design, fabrication, installation and maintenance specialists, so much research and analysis is required to make informed decisions on vent cowls, the different options and where to use them. SVSR is an expert in the field and shares some insights and guidance on vent cowls in sewer network planning.

Read More -->

SVSR sewer ventilation design services to future-proof infrastructure

As a leading provider of sewer vents, vent shaft cowls and odour filters for over 25 years, SVSR has a vast knowledge of industry standards and specific site demands for Sydney Water and regional and council projects. We are pleased therefore to now offer complete sewer ventilation design services, including bespoke design services for councils and utility and commercial clients.

Read More -->

Sewer vent shaft removal, supply and installation for Wingecarribee Council

SVSR specialises in comprehensive sewer vent solutions, including the safe removal of ageing sewer vent shafts, and the fabrication, supply and installation of sewer vents, vent shaft cowls and odour filters. We’ve been working with Wingecarribee Council for close to ten years, removing and replacing several concrete sewer vents that were up to 60 years old.

Read More -->
CONTACT US FOR MORE INFORMATION

Enquiry for: Sewer Vent Design, Fabrication, Installation

Do you have project or construction drawings or plans?YesNo

SVSR GROUP


29 Shepherd St, Liverpool
NSW 2170

02 8798 8788

admin@svsr.com.au