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Water traps - this can lead to back pressure in the pipework when an appliance is discharged which will effect the appliance discharge Problems can arise where air admittance valves are fitted to vent pipes which are not separately vented and which include Space to provide added protection from frost. Most air admittance valesĪre supplied with a formed polystyrene moulding, which should be fitted to the valve top after installation in an unheated roof
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This intake of air equalises the air pressure and the sealingĭiaphragm falls back sealing the valve.
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Sealing diaphragm and allows air to be drawn in - see right lower. When an appliance discharges into the drain, a slight negative air pressure is produced in the drain pipework which lifts the
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Unless an air admittance valves is specifically described as being for external use, it should only be installed internally.Ī sealing diaphragm which under its own weight or slight spring pressure is normally held closed, thus sealing the foul air within The main advantage in using air admittance valves externally is that they reduce the amount of pipework which would otherwise be necessary to take the stack opening sufficient far from any window or other opening in the building. Their use also reduce the amount of pipework needed to fit an external, open soil or ventilating stack.Īir admittance valves used externally are specifically designed to operate within specified environmental conditions which must be checked against the intended installation location. One great advantage of using air admittance valves internally is that they remove the need for holes through the roof or external Those installed internally are generally fitted within rooms or Air admittance valves are used to provided venting for soil and ventilating stacks - most types are for installation within a building, others are specifically designed for outside use.