The absence of efficient drainage ventilation within a drainage system can cause a few problems. Bad drainage smells due to high pressure difference in the drainage system are a common side effect that can be alleviated using AAVs.

In a high rise building for instance, one may have a problem with negative or positive pressure generated within the soil pipes (stacks), resulting in gurgling (causing induced siphonage), bubbling toilets and possible odours.

Residential drainage systems may also face problems generated by negative pressure within the drainage branches (causing induced siphonage), which may result in toilet, kitchen and shower smells.

AAVs are simple, discrete and easy to install. Designed to provide the necessary air for the drainage system, AAVs eliminate the risk of losing the water trap seal, resolving the drainage smell issue. 

AAVs decrease the number of pipes that need to penetrate the roof and walls of a property. An AAV will reduce the number of parts required to ventilate a soil system without any compromise on performance.

How an AAV functions

The membrane in the AAV will remain closed during periods of inactivity; when the drainage system is not being used, the AAV will remain sealed as a result of the gravity force applied on the membrane. When the toilet is flushed, the flow of water causes a negative pressure within the pipework causing the membrane in the valve to open, allowing fresh air to be sucked in through the valve and down into the system until pressure equalisation is achieved. The equalisation of pressure will bring the valve back into its closed mode, preventing the foul air from escaping and the water seals in the traps (bath, toilet and basin) from depleting.

AAV solutions are available from Studor Australia .