The Stainless Steel Castellated Collar provides a strong and reliable connection point for flexible ducting in residential and commercial HVAC systems. Manufactured from high quality stainless steel, this collar is built to withstand demanding conditions including high moisture, roof space exposure, and coastal environments.
The castellated edges allow for quick and firm attachment of duct, ensuring a stable fit and reducing the risk of air leaks. It is commonly used when upgrading systems, installing new duct runs, or replacing older galvanised collars that have corroded over time.
Key Features
- High grade stainless steel for superior corrosion resistance
- Castellated edge design for strong and secure duct attachment
- Suitable for flexible ducting in HVAC systems
- Ideal for roof spaces, underfloor installations, and coastal areas
- Long lasting and low maintenance
- Available in multiple sizes to suit common duct diameters
Typical Applications
- Evaporative cooling systems
- Ducted heating and cooling installations
- Commercial ventilation projects
- Replacement of old or rusted collars
Sizing Options
Common sizes include 300mm, 350mm and 400mm. More sizes are available instore.
Why Choose Stainless Steel
Stainless steel offers a higher level of strength and resistance to rust compared to traditional galvanised materials. This makes it an excellent choice for installers wanting a longer service life and reduced maintenance over time.


