Water supply and waste systems (buildings), Building services, Valves, Ventilation, Air valves, Drainpipes, Approval testing, Internal
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BS EN 12380 2002 Air admittance valves for drainage systems-Requirements, test methods and evaluation of conformity http://www.4shared.com/office/sSzrjLyD/BS_EN_12380_2002_Air_admittanc.html