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What is the recommended height for and Air Admittance Valve in a property?

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What is the recommended height for and Air Admittance Valve in a property?

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there is no height restrictions regarding the property.Air admittance valves can be fitted at any height in a property as long as they are 150mm higher than the water level in the drain that they serve.Open drain vents must terminate 1 mtr. above the highest window.

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Not sure there is a recommended height, just as high as possible and as near as possible to the sanitaryware it is serving.

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