Frequently Asked Questions

Air circulation in the drainage system allows trap seals to work properly. Without ventilation, negative pressure (vacuum) following any discharge would result in the siphonage of the water seal from the trap. The very well known “gurgling” noise is the most common evidence of siphonage. The trap seals form a water barrier that prevents sewer gases and foul odours from entering the living spaces of the building – gravity and air pressure differential create a simple solution that has been working well for decades!

In the past, open vent piping was the only answer to maintaining pressure control and trap seals – the pipes extended through the roof of the building to admit air.
Now Studor technology has changed considerably and you can have a better solution that saves you money on installation. More importantly, you will have a more effective drainage system. Basically, by using Studor AAV solutions, you will allow air to enter WHERE and WHEN required: practically an instantaneous pressure balance at the Point Of Need utilising the concept of Active Control.
The Studor product range offers an alternative to installing an expensive piping system for plumbing ventilation by making it possible to utilise air within the building.

Yes! The Studor Mini-Vent is designed to ventilate from single fixtures to all fixtures connected on the same branch, while the Studor Maxi-Vent provides ventilation for stacks.
The Studor range of products can also be fitted into existing installations (retrofit option or as a problem solver) or in new builds. Have a look at our range of case studies to find out more.

Yes! Studor AAVs comply with all major international standards, including the European ones and the American ones under ASSE 1050 and 1051; these are the performance requirements for stack AAVs for sanitary drainage systems. Studor products are durable because they have been tested to 500,000 cycles (250,000 at -20°C and 250,000 at +65°C at 6 monthly intervals by a third party testing body). A more extensive test was also conducted over ten years ago where the valves were subjected to the equivalent of 1.5 million cycles; this equates to 80 years of service without failure. In addition, each valve is individually tested to fully prove its sealing function to any pressure, as opposed to "batch testing", before it is packaged and shipped.

Studor products are also durable because of the type of plastic they use. An ABS plastic is a stable material under different temperatures, which means that it will not fatigue. Plus, as there is no moving part or mechanical device within the Studor AAVs, it means that there is no compromise on efficiency. This is why Studor products offer a 10 year warranty.

Studor AAVs are designed to comply with temperatures ranging from -20°C to +60°C. The Maxi-Vent has been tested beyond this and is guaranteed from -40°C, subject to following the installation guidelines. Additional protection for extreme temperature is provided via the packaging where necessary and a dedicated aluminium cover is available to further protect the Maxi-Vent from UV, inclement weather and animals/birds in cases of external installation. In addition to this, we also have specialist products which can be used in more diverse, technical applications, for example laboratories.