Fire Collar Sizes Explained (Australia)
Date Posted:25 May 2026
What Size Do You Need?
Fire collars must match pipe diameter to perform correctly in a fire.
Common Sizes
- 50mm – Small waste pipes
- 80–100mm – Standard plumbing
- 150mm+ – Larger commercial systems
Key Rule
The collar must match the outside diameter of the pipe, not nominal size.
Mistakes to Avoid
- Undersizing collars
- Using non-tested systems
- Incorrect installation