ASHRAE Applications recommends a minimum of 4 ACH for natatoriums. Applying that minimum to my Proposed leads to a somewhat oversized pool unit compared to the Baseline system, which reduces my savings a lot. I couldn't find a code requirement of a minimum amount of ACH, which would allow me to size the Baseline with the same number of 4 ACH. Is somewhere aware of any such code requirement?

A related question: would LEED allow to size the Baseline at 4 ACH, even though the project is not a school?

Thanks for chime in,

Demba Ndiaye, Ph.D., P.E., LEED AP BD+C, BEMP