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An alternative to conventionally venting and terminating a soil stack is the use of a Polyvalve air admittance
valve. These valves are designed to reduce the number of vent pipes in a building, which would normally be
vented through the roof to atmosphere.
When installed, the valves are in the closed position and will prevent foul air escaping from the pipework
system in normal atmospheric conditions or when positive pressure is created in the soil stack or waste
pipes, created by the discharge from appliances or fluctuations in pressure within the drainage system. When
negative pressure is encountered, the valve will automatically open and allow air to enter the stack,
equalising pressures and therefore preventing loss of water seals in the traps on appliances.