There have been presentations at the ASHRAE/AHR show for years from SPIDA where example systems have been laid out using round, flat oval, and rectangular product and the relative installed costs were compared. Even using “equal friction” comparisons and not static regain design comparisons, the flat oval systems always come in less expensive – installed – than the comparative rectangular systems meeting the same leakage and performance standards.

We’ll be happy to show you our own comparisons as well as published comparisons from SPIDA and our competitors.