The new version of AS1668.2:2024 was recently published in June. So what does that mean for the old AS1668.2:2012? Now redundant? Actually no. Australian Standards are effectively only guidelines, unless called into effect by the NCC. Towards the back of the NCC there is a table of referenced standards which clarifies which version of the document is applicable. So as of NCC2022, AS1668.2:2012 is still in effect. However, you may be able to call on parts of AS1668.2:2024 for your projects via a performance solution if required. * As a mechanical services engineer, AS1668.2 is one of the most relevant standards for our day-to-day design work. AS1668.2-2012: The use of ventilation and airconditioning in buildings, Part 2: Mechanical ventilation in buildings ______ I try to make regular posts on topics relevant to building services mechanical contractors. Be sure to Connect if you find the content valuable
And it will take a little longer to be referenced in the NZBC G4.
One of the most misunderstood parts of the 2012 version of the standard is demand control ventilation. The standard requires each space to have a population indicator (typically a CO2 sensor), but how often do you see these installed in fitouts? There's mostly only ever a CO2 sensor in the return air from the floor. "Where a group of enclosures are supplied by a single air-handling system, EACH enclosure shall have its actual population demand included in the control strategy for the volume control of introduced outdoor airflow."
Thanks for sharing Phil