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Air Admittance Valves (Ventapipe) Installation Guidelines

Illustrations from BS EN 12056-2:2000 Gravity Drainage Systems Inside Buildings to demonstrate installation variations for Air Admittance Valves

 Primary Ventilated System ConfigurationSecondary Ventilated System Configuration
Control of pressure in the discharge stack is achieved by use of separate ventilating stacks and/or secondary branch ventilating pipes in connection with stack vents. Alternatively, Air Admittance Valves may be used.