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Vantage manufacturers are members of the Window Association of New Zealand (WANZ).

WANZ is an industry organisation that seeks to maintain high standards in the commercial and customer operations of its members. WANZ issues an annual practising certificate and promotes a code of ethics. Members must comply with all relevant mandatory standards. 

WEERS - Window Energy Efficiency Rating System – is guided by WANZ, and gives consumers an accurate energy efficiency rating for each unique window.