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ASHRAE 62.1-2025

Ventilation for Acceptable Indoor Air Quality (ANSI Approved)
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ASHRAE 62.1-2025 sets minimum ventilation rates and design requirements to ensure acceptable indoor air quality (IAQ) in buildings, preventing health issues by controlling contaminants like CO2, odors, and pathogens. It is a critical tool used by engineers, building code authorities, and designers to design, operate, and verify ventilation systems for commercial and institutional buildings, often through prescriptive or performance-based methods.

The 2025 edition refines humidity control, adds emergency ventilation, and improves calculation methods for better IAQ and energy efficiency.


Purpose of ASHRAE 62.1-2025
  • Protect Health: Establishes minimum outdoor air requirements (cfm/person, cfm/sq ft) and air cleaning strategies to keep indoor pollutants below harmful levels, reducing sickness and improving focus.
  • Set Baseline: Provides a national consensus standard for acceptable IAQ, serving as the basis for building codes (like the ICC Mechanical Code) and green building certifications (like LEED).
  • Guide Design & Operation: Offers procedures for designing, installing, commissioning, and operating ventilation systems for various space types (offices, schools, kitchens, labs).
  • Improve Performance: Incorporates energy efficiency through strategies like demand-controlled ventilation (DCV) and better humidity control.

How it's Used
  1. Calculate Ventilation Rates: Engineers use formulas (like the Ventilation Rate Procedure - VRP) based on space type, area, and occupancy to determine the needed outdoor airflow (Vbz).
  2. Design the System: Specify equipment (fans, filters, economizers) to deliver the required outdoor air, control contaminants, and manage pressurization (positive, negative, neutral) for different zones.
  3. Apply Procedures: Use the standard's two main methods:
    • Ventilation Rate Procedure (VRP): A prescriptive, zone-by-zone calculation.
    • Indoor Air Quality Procedure (IAQP): A performance-based approach that allows for alternative strategies (like advanced filtration/UV) to reduce outdoor air, provided IAQ is maintained.
  4. Commission & Operate: Ensure systems are balanced and functioning as designed, often using sensors (like CO2 monitors) and controls for continuous performance monitoring.
  5. Meet Codes: Authorities use it to verify compliance, with states and jurisdictions adopting it into law.
SDO ASHRAE: American Society of Heating, Refrigerating, and Air Conditioning Engineers
Document Number Standard 62
Publication Date Oct. 1, 2025
Language en - English
Page Count 94
Revision Level
Supercedes
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