Adopts With Amendments
Chapter 4
Ventilation
International Mechanical Code 2021
[F] 401 Ventilation General
Section 401 — Ventilation General. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 401.1 Scope - Ventilation
Section 401.1 — Scope - Ventilation. This section establishes the scope, applicability, and administrative provisions for enforcement of this code. Refer to the official code text for complete requirements.
[F] 401.1.1 Ventilation General Requirements
Section 401.1.1 — Ventilation General Requirements. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 401.1.2 Refrigerant Types
Section 401.1.2 — Refrigerant Types. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 401.1a Exhaust Systems General
Section 401.1a — Exhaust Systems General. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 401.2 Ventilation Rate
Section 401.2 — Ventilation Rate. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 401.2.1 Recirculation Restrictions
Section 401.2.1 — Recirculation Restrictions. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 401.2a Recirculation of Exhaust Air
Section 401.2a — Recirculation of Exhaust Air. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 401.3 When Required
Section 401.3 — When Required. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 401.3.1 Ventilation Rate Procedure - Outdoor Air
Section 401.3.1 — Ventilation Rate Procedure - Outdoor Air. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 401.4 Intake Opening Location
Section 401.4 — Intake Opening Location. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 401.4.1 Intake Opening Separation
Section 401.4.1 — Intake Opening Separation. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 401.5 Exhaust Openings
Section 401.5 — Exhaust Openings. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 401.6 Contaminant Sources
Section 401.6 — Contaminant Sources. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 402.1 Natural Ventilation
Section 402.1 — Natural Ventilation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 402.1.1 Natural Ventilation
Section 402.1.1 — Natural Ventilation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 402.2 Openable Area - Natural Ventilation
Section 402.2 — Openable Area - Natural Ventilation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 402.2.1 Adjoining Spaces
Section 402.2.1 — Adjoining Spaces. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 402.3 Adjoining Spaces
Section 402.3 — Adjoining Spaces. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 403.1 Mechanical Ventilation System Design
Section 403.1 — Mechanical Ventilation System Design. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 403.1.1 Ventilation Rate Procedure
Section 403.1.1 — Ventilation Rate Procedure. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 403.2 Outdoor Air Required
Section 403.2 — Outdoor Air Required. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 403.2.1 Recirculation of air
Section 403.2.1 — Recirculation of air. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 403.2.2 Transfer air
Section 403.2.2 — Transfer air. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 403.3 Ventilation rate procedure
Section 403.3 — Ventilation rate procedure. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 403.3.1 Zone Outdoor Airflow
Section 403.3.1 — Zone Outdoor Airflow. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 403.3.2 Transfer Air
Section 403.3.2 — Transfer Air. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 403.4 Enclosed Parking Garage Ventilation
Section 403.4 — Enclosed Parking Garage Ventilation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 403.4.1 Exhaust Ventilation
Section 403.4.1 — Exhaust Ventilation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 403.5 System operation
Section 403.5 — System operation. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 403.5.1 System Controls
Section 403.5.1 — System Controls. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 403.6 Variable air volume systems
Section 403.6 — Variable air volume systems. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 403.7 Motor Vehicle Facilities - Ventilation
Section 403.7 — Motor Vehicle Facilities - Ventilation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 404.1 Toilet Room Ventilation
Section 404.1 — Toilet Room Ventilation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 404.1.1 Enclosed Parking Garage Ventilation
Section 404.1.1 — Enclosed Parking Garage Ventilation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 404.2 Garage CO monitoring
Section 404.2 — Garage CO monitoring. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 404.2.1 CO Monitoring
Section 404.2.1 — CO Monitoring. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 404.3 Repair garages ventilation
Section 404.3 — Repair garages ventilation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 405.1 Systems Controls and Dampers
Section 405.1 — Systems Controls and Dampers. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 405.1.1 Kitchen Exhaust Hood Systems
Section 405.1.1 — Kitchen Exhaust Hood Systems. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 405.2 Economizer Controls
Section 405.2 — Economizer Controls. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 405.3 Carbon Monoxide Detection
Section 405.3 — Carbon Monoxide Detection. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 406.1 Enclosed Parking Garage Ventilation
Section 406.1 — Enclosed Parking Garage Ventilation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 406.1.1 Outdoor Air Intake Restrictions
Section 406.1.1 — Outdoor Air Intake Restrictions. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 406.2 Intake Separation
Section 406.2 — Intake Separation. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 406.3 Type II Hoods
Section 406.3 — Type II Hoods. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 406.4 Exhaust Hood Size
Section 406.4 — Exhaust Hood Size. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 407.1 Kitchen Exhaust Rates
Section 407.1 — Kitchen Exhaust Rates. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 407.1.1 Exhaust Discharge Location
Section 407.1.1 — Exhaust Discharge Location. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 407.2 Operating Room Ventilation
Section 407.2 — Operating Room Ventilation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 501.1 Exhaust Systems - General
Section 501.1 — Exhaust Systems - General. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 501.2 Exhaust Discharge
Section 501.2 — Exhaust Discharge. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
Code sections are sourced from the International Code Council (ICC) and NFPA. Refer to ICC Digital Codes or NFPA for the authoritative source documents.