wrote:

ASHRAE's standard of 15 cfm per full-time occupant
(which used to be 5 cfm.)

300% upward revision.... I'm wondering why this spec change occurred.

The original (19th C?) standard was based on productivity. Somebody noticed
that coal mine workers with less than 5 cfm fell asleep :-)

The newer version is based on odors and other pollutants.

Nick