Achieving balance among desired goals for indoor air quality (IAQ), energy consumption, and occupant Comfort / Health within the built environment is challenging. ASHRAE endeavors to achieve this through guidelines and standards focused on advancing building science as it relates to environmental quality. This presentation will review the commonly used design guides found in ANSI/ASHRAE Standard 62.1, “Ventilation and Acceptable Indoor Air Quality.” 

 The current form of ANSI/ASHRAE Standard 62.1-2022 outlines mechanical ventilation procedures to provide acceptable IAQ in buildings: The Ventilation Rate Procedure and the Indoor Air Quality (IAQ) Procedure. While the Ventilation Rate Procedure provides only a dilution solution for the control of typical offending contaminants for a specified occupancy, the IAQ Procedure provides a directed approach by reducing and controlling the concentrations of selected air contaminants of concern through both dilution and enhanced air cleaning.

 Rather than relying only on diluting the concentration of contaminants with outdoor air, designing with enhanced filtration of both recirculated and ventilation outdoor air can improve IAQ, reduce airborne infectious disease and enhance cognitive functioning within the occupied space. This presentation will focus on the application of enhanced particle, gas-phase and biological filtration for compliance with Standard 62.1 and recently published information on the Control of Infectious Aerosols – Standard 241P. An outline of the design aspects to consider will be reviewed, with the focus on achieving acceptable levels of contaminants of concern within the occupied space while considering the desire to meet healthy building standards and improved cognitive functioning.

Presented by Brian Monk

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