Are air admittance valves legal in UK?

Except in Scotland where the valve has been certified by a notified body, installation of an AAV outside of the property is not permitted by Regulation.

Where are air admittance valves allowed?

Stack-type air admittance valves shall be located not less than 6 inches (152 mm) above the flood level rim of the highest fixture being vented. The air admittance valve shall be located within the maximum developed length permitted for the vent.

Why are AAV not allowed?

Because an AAV requires negative pressure to open, it cannot be installed to vent a sump pump, which generates positive air pressure when operating. Also, a home’s plumbing drainage cannot rely entirely on AAVs; a minimum of one vent through the roof is required by the building code.

Can soil pipe vent in loft?

Soil Vent Pipe Venting Into Loft Yep, the soil pipe is the one you’re thinking of. The ventilation for the waste from your toilet. Yuck. This large, grey pipe is supposed to reach your roof or an external wall and be vented to the outside air.

Can you use AAV on toilet?

Be sure that Air Admittance Valve is a high-quality, safe, and sound solution, which will work without a mess or leaking. No matter if you test it in dual flush toilets, bathtubs drain, or gravity-fed flushing toilets, this modern plumbing gadget will work impeccably.

How high should a soil vent pipe be?

900mm
Regulations state that vent pipes that are situated within 3m of an opening window must terminate at least 900mm above the eaves. On a two-storey building that generally means that the open end of the pipe will be above the level of the eaves.

What is the minimum height of an air admittance valve above the highest spillover level?

Air Admittance Valves must be installed on a soil pipe at least 200mm above the highest water entry point on the system – that is the highest point that water can normally reach in a soil pipe.

Are air admittance valves regulated in the UK?

The document provides clear advice on how to position air admittance valves correctly, as well as highlighting the different regulations currently in place across England, Wales, Scotland and Northern Ireland. Air admittance valves are used to ventilate soil and waste pipes so that waste water drains properly from a property.

Where do you install an air admittance valve?

Air Admittance Valves must be installed on a soil pipe at least 200mm above the highest water entry point on the system – that is the highest point that water can normally reach in a soil pipe. For aesthetic purposes though they are usually installed in the loft or in a duct or cupboard.

What is an air admittance valve (AAV)?

The air admittance valve (AAV) is a device designed to allow air to enter the drainage system to balance the pressure and prevent siphonage of the water trap when negative pressure develops in the system. In this way, it is used on individual vents, branch vents and circuit vents in lieu of terminating vents to the exterior of the structure.

What size admittance valve do I Need?

Air admittance valves are suitable for venting branch pipes i.e. pipework connecting to WCs, wash hand basins, baths/shower, sinks and appliances to the soil stack. Smaller valves are designed to fit 32 mm, 40 mm, or 50mm waste pipes.