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Specifies site wind speed classes for determining design wind speeds and wind loads for NCC Class 1 and 10 buildings within the geometric limits given in Clause 1.2; the classes are for use in the design of housing and for design, manufacturing and specifying of building products and systems used for housing.

This Certifier Practice Standard is prepared by the Commissioner for Fair Trading under section 14 of the Building and Development Certifiers Act 2018 (B&DC Act); Section 14 provides that a registered certifier’s conditions of registration may require the certifier to carry out certification work in accordance with specified standards or methodologies prepared by the Commissioner.

This Guide is intended to supplement to the "Criteria for the Passive House, EnerPHit and PHI Low Energy Building Standards" ("Criteria") published by the Passive House Institute and posted online; it explains the Criteria's requirements given here in a brief and precise manner.