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320mm: It represents the size of the base that sits at the bottom of the underground chamber.

185mm Invert Height: The “invert height” refers to the height of the internal or lower surface of the chamber base from the bottom. In this case, it’s 185mm, which means that the internal surface of the chamber base is elevated by 185mm from the very bottom of the chamber. This elevation is essential for maintaining the desired depth and slope of the underground chamber.

Chamber bases are critical components in underground utility infrastructure. They serve as the foundation for various utility equipment and help ensure proper drainage, support, and access for maintenance and inspection.