ACHR News ran a story on How Contractors Can Help Improve IAQ in Schools featuring quotes from several industry experts, including enVerid CEO Christian Weeks. Christian is quoted as saying:
“ASHRAE’s new standard for the control of infectious aerosols, Standard 241, Control of Infectious Aerosols, published in June 2023, states that classrooms should provide 40 cfm of clean air per person, said Christian Weeks, CEO of enVerid Systems.
‘As Standard 241 states, this clean air target can be achieved with filtered return airflow, inactivation of infectious aerosols, and/or outdoor airflow,” Weeks said. “In many cases, simply installing a HEPA filter in a classroom will allow classrooms to hit the 40 cfm of clean air per person target.’”
And:
“Improving filtration is more energy-efficient than bringing in more outside air when it is hot or cold outside because conditioning outside air for comfort is energy-intensive,” Weeks said. “Improving filtration can be done at the central HVAC system, if one exists, by upgrading to MERV 13 or higher-efficiency particle filters or by deploying HEPA filters directly in the space.”