The intent of the changes to AS4254.1 2012 in regards to hanging of flexible ductwork was to deal with the potential of the flex duct being kinked by traditional hanging methods and thus reducing the airflow through the duct.
The revised Standard now calls for a load distribution material a minimum of 75mm wide to help prevent or reduce this kinking effect on flexible duct work.
It also calls for the load distribution material to be fire resistant. The intent of this is to prevent the use of a combustible material, which would not self-extinguish when exposed to a flame, being used as a load supporting system when in direct contact with the underside of the flex duct. Download the brochure here.
Easy to prepare and install with just a few minutes of your time.