The ASHRAE 62.1 standard relates to which building aspect?

• A. Energy efficiency standards for mechanical systems.
• B. Ventilation and indoor air quality.
• C. Structural load calculations.
• D. Fire protection design guidelines.

Answer: (B)

Ventilation and indoor air quality in buildings are what ASHRAE 62.1 addresses. The standard sets the minimum ventilation rates and outdoor-air requirements to keep indoor air quality at acceptable levels, and it also covers filtration and the steps needed to verify system performance through testing and commissioning. Its focus is on how air is brought in, circulated, and cleaned to protect occupant health and comfort. It is not about energy efficiency standards for mechanical systems, structural load calculations, or fire protection design guidelines, so the option that emphasizes ventilation and indoor air quality is the best fit.