Concurrent version: Effective on 28 July 2025
G4 Ventilation Acceptable Solution G4/VM1 Fifth Edition provides a compliance pathway for meeting the ventilation performance requirements of Clause G4 of the New Zealand Building Code, specifically for the ventilation rate and air purity. The fifth edition has been published in standalone format with improved clarity, a consistent structure, and updated terminology.
This information is published by the Ministry of Business, Innovation and Employment’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people:
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