A blower door test to measure the airtightness in a New Zealand Passive House building needs to be performed in accordance with AS/NZS ISO 9972:2015. The only exception to this is the calculation of the internal reference volume outlined in section 6.1.1 of the standard. The air change rate (ach) at a pressure difference of 50 Pa is to be determined. The Passive House standard requires an n50-value of 0.6 h-1 or lower.
The free guide below sets out all the requirements for the testing and measuring the airtightness in NZ to comply with AS/NZS ISO 9972:2015 and the Passive House standard. The guide answers all the commonly asked questions on this subject, however, if you have any further questions please ask in the comments below.