Clarity given for use of air admittance valves (AAVs) externally

  • 18 Apr 2017

Drainage ventilation expert Studor has issued clarification as to whether air admittance valves (AAVs) can be used for external applications.

Studor’s Maxi-Vent and Wavin branded OsmaVent 110 can both be used externally, as clarified by their most recent BBA agrément certificates which specifically refer to external use.

The BBA certificates verify that the AI rated valves perform from -20°C to +60°C in accordance with EN12380. However, an independent test found that the valves can operate in temperatures as low as -40°C without the insulating cap.

In addition, the valves are manufactured from an ABS plastic which includes a UV stabiliser to protect against any degradation effects from ultraviolet radiation.

To protect the units from wildlife and accidental damage, the certificates note that an aluminium cover and insulating cap should be used. Studor’s Alu Cover, which can be specified to match a particular RAL colour, can be purchased independently of the AAVs as needed and are easy to fit. 

Studor’s Technical Director, Steve White, commented: “Installing an AAV externally protects against pressure fluctuations due to ‘wind effect’ which can lead to traps self-siphoning. 

Another key benefit of using an AAV externally is that it allows a vent pipe to be terminated close to a window or other opening – removing the need for additional pipework to locate it further away. It can also improve the aesthetics of a building by allowing the soil stack to be terminated below the roofline, avoiding the need for the protrusion of an ugly vent pipe above the roofline.”

Studor has been selling AAVs for external use for more than 10 years, each comes with a lifetime warranty and requires no maintenance.

Leave a Reply

More articles

GEZE

Extra Safety for Extra Care with GEZE in Kent

Extra safety has been incorporated into an extra care housing development for over 55s, courtesy of a GEZE UK natural smoke ventilation system.

Posted in Architectural Ironmongery, Articles, Building Industry News, Building Products & Structures, Building Services, Case Studies, Doors, Health & Safety, Heating, Ventilation and Air Conditioning - HVAC, Posts, Retrofit & Renovation, Security and Fire Protection, Windows

What to expect from Schlüter at Hard Surfaces 2019

Schlüter-Systems Ltd has announced that it will exhibit at this year’s Hard Surfaces Show.

Posted in Articles, Building Industry Events, Building Industry News, Exhibitions and Conferences, news, Posts

ROCKWOOL wins SIG Supplier of the Year award

ROCKWOOL has been awarded the coveted Supplier of the Year title by SIG, distributor of insulation, dry lining and related products.

Posted in Articles, Awards, Building Industry Events, Building Industry News, Building Products & Structures, Insulation, news

Aggregate Industries’ SuperCurve chosen to resurface Port of Liverpool

Aggregate Industries’ new SuperCurve asphalt solution has demonstrated its ability to withstand high-levels of HGV traffic during a recent resurfacing project.

Posted in Articles, Building Industry News, Building Products & Structures, Civil Engineering, Hard Landscaping & Walkways, Landscaping, Posts, Retrofit & Renovation, Sustainability & Energy Efficiency