I was looking for the carbon dioxide generation rate for an aerobics room. I got to the built in people definitions and they all use the same 0.000024 (IP Units) for the closed office, break room, and Secondary School Gym. Obviously i need to change this for a gym, so i look up Ashrae 62.1 2013 and find Appendix X Figure C2 which says maybe a 1 liter per minute. This is in SI units. So i try to convert to IP units but Open studio is not using CFM, it is using CFHR/MINBTU. Why does this unit include energy and not match Ashrae volumetric measurement. Also what is HR/MIN? it doesn't make any sense. It should either be CFM or CFH. I've been an engineer a long time and never seen HR/MIN before in a units.