In July of 2023, the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), published its pioneering consensus-based, code-enforceable Standard 241, Control of Infectious Aerosols. Developed to reduce the risk of infectious aerosol transmission in buildings, Standard 241 establishes minimum requirements to reduce transmission risk of airborne viruses such as SARS-COV-2, the flu virus and other pathogens.

The standard applies to a wide range of building types, including single and multi-family homes, offices, schools and healthcare facilities. It includes both new and existing buildings, as well as major renovations. Standard 241 specifies a wide range of criteria – including for both effectiveness and safety – that air purification devices must meet in order to be in compliance. CerroZone technology meets or exceeds all criteria in the standard, as outlined in the list below:

• Pg 11, Table 7-1: MERV 11+ removal efficiency 
• Pg 17, 9.1.7: Efficacy per fan speed 
• Pg 23, A1.2.1: Testing shall be completed by a third-party independent laboratory 
• Pg 23, A1.2.2 a: Chamber volume shall be at least 800 cubic feet 
• Pg 24, A1.3.2: Test with non-enveloped MS2 
• Pg 27, Table A-1: Formaldehyde safety 
• Pg 27, Table A-1: Ozone safety 
• Pg 27, Table A-1: Particulate matter count concentration safety