This New Zealand Building Code G4/AS1 Acceptable Solution document provides technical requirements for the ventilation of buildings. The document outlines the regulatory framework for achieving compliance with Clause G4 of the New Zealand Building Code. It details the mandatory performance criteria for mechanical and natural ventilation systems across diverse building occupancies. The text includes specific methodologies for calculating airflow rates, defining exhaust requirements, and specifying permissible ductwork configurations. It serves as a primary reference for establishing safe indoor air quality levels. The publication is structured to guide practitioners through the design and assessment process, ensuring that all ventilation strategies meet the established statutory health and safety standards for the built environment.

The download is a 666 KB file containing .PDF files.

Architects and mechanical engineers integrate this document into their project documentation phase to verify that ventilation designs conform to national regulations. It is typically referenced during the preliminary design and building consent application stages. Designers use these specifications to size air handling equipment, determine openable window areas, and validate mechanical extraction rates. The file is a standard PDF that can be easily cross-referenced alongside CAD or BIM models during technical reviews to ensure compliance with the mandated performance requirements for all new building works.

Engineers and architects utilise this Acceptable Solution for residential, commercial, and industrial projects throughout New Zealand. It is essential for those involved in HVAC system design, building envelope detailing, and performance-based compliance assessments. When preparing documentation for building consent, professionals cite these requirements to demonstrate that ventilation systems satisfy the G4 clause. Practitioners searching for this resource often look for mechanical ventilation standards, building performance guidelines, and regulatory compliance data to ensure their design solutions meet the specific ventilation needs of various occupancy types.