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ban all sheds, his issue was air extract from the toilet and where to vent it, regardless of how old the item is, it is worth discussion. He was advised to think about the soil stack, this was recieved here with much mirth. For your info, the soil stack is for venting sewage gasses. As I said...

Quasar27, if theres no detrius falling from above then the only problem you have is rising gas, for a tight non return vent spigot use an underground drainage non return valve :o) simples.