Vent shaft cowls

With our decades of experience in the design, fabrication and installation of sewer vent shafts, we have come to learn a thing or two about vent cowls. And that knowledge has seen us develop market leading designs that are high quality and fit for purpose.

We offer cowls in all sizes from DN150 – DN225/DN250 – DN300. Both 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 to you is that this also helps to reduce ongoing maintenance costs.

If you are unsure of the type of cowl to best suit your job or you require a custom design, our experienced team can run you through the available options.

Educt cowls


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

Wire vent cowls (passive)
In cases where access for ongoing maintenance is quite limited, e.g. in a residential backyard, a wire vent pipe cowl is the best option.

Also known as a bird cage, this type of cowl is passive and non-directional, requiring minimal maintenance.

Varying sizes of wire educt cowls

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

  • Material: Stainless steel
  • Finish: Primed and painted in your colour of choice
  • 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
Varying sizes of Rotating Educt Cowls

Rotating educt vent cowls (active)
In order to maximise the extraction of corrosive and odorous gases from sewer lines and maintenance holes, rotating 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 elements.

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

  • Materials: Turbine & Flue-Aluminium grade 5005 H34
  • Bearings: Steel NSK BFW30 Bearing Deflector Flange-Aluminium grade
  • Rivets: Stainless steel STST grade 302
  • Screws & Nuts: 304 or 316 stainless steel
  • Shafts & Brackets: 303 or 304 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 700.11

Induct cowls


Induct 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 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. They work by drawing oxygen into the sewer, increasing air-flow, thereby reducing septicity, corrosion and concrete cancer.

Like the educt cowls, they also have UV stability to withstand elements.

Varying sizes of Rotating Induct Cowls

Our rotating induct vent shaft cowls follow the below specifications:

  • Materials: Bearing Deflector Flange-Aluminium grade
  • Rivets: Stainless steel STST grade 302
  • Screws & Nuts: 304 or 316 stainless steel
  • Shafts & Brackets: 303 or 304 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 700.11
Custom Design Vent Cowls

Custom design vent cowls


We know that no two jobs are the same… often the solutions to get the job done need to be innovative and require outside of the box thinking. As a company, we prioritise research and development to ensure we stay ahead of customer needs.

We take this approach with our vent cowls, working with many customers on custom designs to suit the job.

At the end of the day, our team always strives to produce work that is of the highest quality and focuses on the needs of the customer. Our solutions are best practice and our capability second to none.

Whatever your needs for custom vent cowls, our team has the expertise to deliver.

We have a range of vent shaft cowls to meet your project requirements. Contact us to discuss your specific needs.

Case Studies


CUSTOM INDUCT VENT COWL

Comdain Infrastructure manage large multi-million dollar projects in the wastewater and water industry. When the induct vent cowls that they had always used for their projects were discontinued, they knew SVSR were the team for the job.

Read More -->

THE DN400 X 25M VENT SHAFT

Many in the sewer vent shaft industry would balk at a site that called for a non-standard vent shaft design. But as Jeff from Ken Hale Civil discovered, that’s just what the team at SVSR love to get their hands dirty with.

Read More -->

SEWER VENT SHAFTS… WITH STYLE

Sewer vent shafts are not usually something you associate with style… but with the capability and experience amongst the SVSR team, nothing is ever out of the question. They just get the job done.

Read More -->
CONTACT US FOR MORE INFORMATION

Enquiry for: Sewer Vent Suppliers & Repairs

Do you have copies of Project or Construction drawings or plans?YesNo

SVSR GROUP


29 Shepherd St, Liverpool
NSW 2170

02 8798 8788