ANSI ASHRAE Standard 62.1-2022 PDF

Full title and description

ANSI/ASHRAE Standard 62.1-2022 — Ventilation and Acceptable Indoor Air Quality. A consensus standard that specifies minimum ventilation rates and other measures intended to provide indoor air quality (IAQ) acceptable to human occupants and to minimize adverse health effects. The standard provides procedures and methods for meeting ventilation and IAQ requirements for spaces intended for human occupancy in commercial, institutional, and other non‑residential buildings (excluding dwelling units covered by ANSI/ASHRAE 62.2).

Abstract

Standard 62.1-2022 establishes mandatory and recommended practices for the design, installation, commissioning, operation, and maintenance of ventilation and air‑cleaning systems. It defines two primary compliance paths (the Ventilation Rate Procedure and the IAQ Procedure), minimum outdoor air requirements by space type, requirements for system and equipment performance, guidance on filtration and air cleaning, provisions for moisture control and certain contaminant sources, and measures to address intake/exhaust separation and commissioning to support good IAQ.

General information

• Status: Superseded (replaced by ANSI/ASHRAE Standard 62.1-2025).
• Publication date: 2022 (published September 2022).
• Publisher: American Society of Heating, Refrigerating and Air‑Conditioning Engineers (ASHRAE); ANSI‑approved.
• ICS / categories: 91.140 — Installations in buildings (91.140.30 Ventilation and air‑conditioning systems).
• Edition / version: 2022 (ANSI/ASHRAE Standard 62.1-2022).
• Number of pages: 86 pages (approx., depending on format).

Scope

Applies to spaces intended for human occupancy within buildings except dwelling units in residential occupancies with nontransient occupants (those are covered by ANSI/ASHRAE 62.2). The standard is intended for use in new construction, additions, and certain changes to existing buildings, and it can be used as a regulatory reference or design guideline to achieve acceptable indoor air quality through ventilation, air cleaning, source control, moisture management, and appropriate system commissioning and operation.

Key topics and requirements

• Minimum outdoor air ventilation rates by space type and by occupant/area.
• Two compliance paths: Ventilation Rate Procedure (prescriptive) and IAQ Procedure (performance‑based).
• Requirements for system and equipment design, installation, commissioning, operation, and maintenance.
• Filtration and air‑cleaning requirements and guidance (including filtration efficiency considerations).
• Provisions for control of moisture, biological growth, and certain contaminant sources (including construction-period controls).
• Limits and guidance for outdoor‑air intake and exhaust separation distances to minimize contamination of makeup air.
• Use of dual units of measurement, updated definitions, air‑density adjustments, and reorganized system/equipment requirements to reflect airflow paths.
• Normative and informative appendices to support calculations, example procedures, and compliance tools.

Typical use and users

Used by HVAC engineers, mechanical designers, architects, building code officials, commissioning agents, facility managers, IAQ consultants, and specifications writers. Typical applications include designing and sizing ventilation systems, writing project specifications, demonstrating code compliance, preparing commissioning and O&M procedures, and evaluating or improving IAQ in commercial, institutional, and other non‑residential buildings.

Related standards

Key related documents include ANSI/ASHRAE Standard 62.2 (residential ventilation and IAQ), ASHRAE/ASHE Standard 170 (ventilation of health‑care facilities), ANSI/ASHRAE Standard 55 (thermal environmental conditions for human occupancy), ANSI/ASHRAE Standard 188 (legionellosis risk management), and relevant local mechanical codes and international standards on air filtration (for example ISO 16890 series).

Keywords

ventilation; indoor air quality; IAQ; outdoor air; ventilation rate procedure; IAQ procedure; filtration; air cleaning; commissioning; exhaust/intake separation; moisture control; HVAC design; ASHRAE; ANSI.

FAQ

Q: What is this standard?

A: ANSI/ASHRAE Standard 62.1-2022 is an industry consensus standard that specifies minimum ventilation rates and other measures intended to provide acceptable indoor air quality in non‑residential buildings and to minimize adverse health effects.

Q: What does it cover?

A: It covers required outdoor‑air ventilation rates by space type, two compliance paths (Ventilation Rate Procedure and IAQ Procedure), system and equipment requirements, filtration and air‑cleaning guidance, moisture and certain contaminant controls, intake/exhaust separation rules, commissioning, and ongoing operation and maintenance practices.

Q: Who typically uses it?

A: HVAC designers and engineers, architects, code officials, commissioning agents, facility managers, indoor‑air‑quality professionals, and others involved in the design, construction, operation, and regulation of commercial and institutional buildings.

Q: Is it current or superseded?

A: ANSI/ASHRAE Standard 62.1-2022 was published in 2022 but was superseded by ANSI/ASHRAE Standard 62.1-2025 (the 2025 edition is the current ASHRAE 62.1 standard). Users implementing new projects or updating compliance should consult the 2025 edition for the latest requirements.

Q: Is it part of a series?

A: Yes. Standard 62.1 is the non‑residential companion to ANSI/ASHRAE Standard 62.2 (residential ventilation and IAQ). It also connects to other ASHRAE standards (for example Standards 55, 170, and 188) and to model mechanical codes that reference ventilation provisions.

Q: What are the key keywords?

A: Ventilation; indoor air quality; IAQ; outdoor air; ventilation rate procedure; IAQ procedure; filtration; air cleaning; commissioning; exhaust intake separation; moisture control; HVAC design; ASHRAE.