Do You Need an ASHRAE Standard 241 Readiness Assessment?
ASHRAE Standard 241 Compliance and Option Cost Calculator
Standard 241 is about more than infectious aerosols
ASHRAE 241 was developed to respond to aerosol-delivered pathogens such as COVID-19. Fortunately, indoor air cleaning solutions identified in the standard also effectively reduce other fine and ultrafine particles including mold spores, environmental dust, PM2.5, wildfire smoke, copier toner, and combustion by-products.
By establishing a standard that removes ultrafine particles, ASHRAE Standard 241 has implications for indoor air quality that go beyond infectious aerosol mitigation.
“Standard 241 represents a significant step forward in prioritizing indoor air quality.”
“By implementing the requirements outlined in this standard, we can improve the health, well-being and productivity of building occupants. This standard empowers building owners, operators and professionals to take proactive measures in safeguarding indoor environments. It’s an essential tool for creating healthier indoor environments and promoting sustainable practices.”
ASHRAE press release June 24, 2023
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ASHRAE Standard 241 compliance opens new options to achieve clean air goals and reduce energy costs
ASHRAE Standard 241 allows for the use of multiple air cleaning solutions in addition to outdoor air. The equivalent clean air flow per individual (ECAi) can be calculated for the specific density of any shared space and can be achieved through outdoor air, if feasible, but also through recirculated, purified air, and air disinfection.
Outside air provides aerosol dilution, with a higher energy expense as the air must be conditioned (heated or cooled) before it can be introduced. Outdoor air may also bring indoors other toxins and allergens.
In Room Air Purifiers
As identified in ASHRAE Standard 241, properly selected in-room air purifiers can be well-suited for removal and neutralization of viruses, pathogens, and other ultrafine particles. Unlike outdoor air, these additional tools can support elevated clean airflow goals with lower cost and energy use, as the air does not need to be conditioned before use.
To be ASHRAE 241 complaint, in-room air purifiers must be certified zero-ozone, create no byproducts, Energy Star certified, and pass independent tests for effective removal of aersolized particles.