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ASHRAE Standard 62.2-2019 -- Ventilation and Acceptable Indoor Air Quality in Residential Buildings- (ANSI Approved), 2019
- ANSI/ASHRAE Standard 62.2-2019 [Go to Page]
- Return to Previous Page
- CONTENTS
- FOREWORD
- 1. PURPOSE
- 2. SCOPE [Go to Page]
- 2.1 This standard considers chemical, physical, and biological contaminants that can affect air quality. Thermal comfort requirements are not included in this standard.
- 2.2 While acceptable IAQ is the goal of this standard, it will not necessarily be achieved even if all requirements are met
- 3. DEFINITIONS
- 4. DWELLING-UNIT VENTILATION [Go to Page]
- 4.1 Ventilation Rate. A mechanical exhaust system, supply system, or combination thereof, shall be installed to operate for each dwelling unit to provide continuous dwelling-unit ventilation with outdoor air at a rate not less than specified in Secti...
- Table 4-1a (I-P) Ventilation Air Requirements, cfm
- Table 4-1b (SI) Ventilation Air Requirements, L/s
- 4.2 System Type. The dwelling-unit mechanical ventilation system shall consist of one or more supply or exhaust fans and associated ducts and controls. Local exhaust fans shall be permitted to be part of a mechanical exhaust system. Where local exhau...
- Table 4-2 Filtration Factor for Filters Tested to ASHRAE Standard 52.2
- Table 4-3 Filtration Factor for Filters Tested to AHRI 680
- Table 4-4 Filtration Factor for Filters with a PM2.5 Efficiency Designation
- 4.3 Airflow Measurement. The airflow required by this section is the quantity of outdoor ventilation air supplied and/or indoor air exhausted by the mechanical ventilation system as installed and shall be measured according to the ventilation equipme...
- 4.4 Control and Operation. A readily accessible manual on-off control, including but not limited to a fan switch or a dedicated branch-circuit overcurrent device, shall be provided. Controls shall include text or an icon indicating the system’s fun...
- 4.5 Variable Mechanical Ventilation. Dwelling-unit mechanical ventilation systems designed to provide variable ventilation shall comply with Section 4.5.1, 4.5.2, or 4.5.3. Sections 4.5.2 and 4.5.3 also require compliance with Normative Appendix C an...
- 4.6 Equivalent Ventilation. A dwelling-unit ventilation system shall be designed and operated in such a way as to provide the same or lower annual exposure as would be provided by complying with Section 4.1. The calculations shall be based on a singl...
- 5. LOCAL EXHAUST [Go to Page]
- 5.1 Local Mechanical Exhaust. A local mechanical exhaust system shall be installed in each kitchen and bathroom. Nonenclosed kitchens shall be provided with a demand-controlled mechanical exhaust system meeting the requirements of Section 5.2. Each l...
- 5.2 Demand-Controlled Mechanical Exhaust. A local mechanical exhaust system shall be designed to be operated as needed.
- 5.3 Continuous Mechanical Exhaust. A mechanical exhaust system shall be installed to operate continuously. The system may be part of a balanced mechanical ventilation system. See ASHRAE Guideline 24, Chapter 10, for guidance on selection of methods.
- Table 5-1 Demand-Controlled Local Ventilation Exhaust Airflow Rates
- Table 5-2 Continuous Local Ventilation Exhaust Airflow Rates
- Table 5-3 Prescriptive Duct Sizing
- 5.4 Airflow Measurement. The airflow required by this section is the quantity of indoor air exhausted by the ventilation system as installed and shall be measured according to the ventilation equipment manufacturer instructions, or by using a flow ho...
- 6. OTHER REQUIREMENTS [Go to Page]
- 6.1 Adjacent Spaces and Transfer Air. Measures shall be taken to minimize air movement across envelope components to dwelling units from adjacent spaces, such as garages, unconditioned crawlspaces, unconditioned attics, and other dwelling units. Pres...
- 6.2 Instructions and Labeling. Information on the ventilation design and/or ventilation systems installed, instructions on their proper operation to meet the requirements of this standard, and instructions detailing any required maintenance (similar ...
- 6.3 Clothes Dryers. Clothes dryers shall be exhausted directly to the outdoors.
- 6.4 Combustion and Solid-Fuel-Burning Appliances
- 6.5 Airtightness Requirements
- 6.6 Ventilation Opening Area. Spaces shall have ventilation openings as listed in the following subsections. Such openings shall meet the requirements of Section 6.8.
- 6.7 Minimum Filtration. Mechanical systems that supply air to an occupiable space through ductwork exceeding 10 ft (3 m) in length and through a thermal conditioning component, except evaporative coolers, shall be provided with a filter having a desi...
- 6.8 Air Inlets. Air inlets that are part of the ventilation design shall be located a minimum of 10 ft (3 m) from known sources of contamination such as a stack, vent, exhaust hood, or vehicle exhaust. The intake shall be placed so that entering air ...
- 6.9 Carbon Monoxide Alarms. A carbon monoxide alarm shall be installed in each dwelling unit in accordance with NFPA 720, and shall be consistent with requirements of applicable laws, codes, and standards.
- 7. AIR-MOVING EQUIPMENT [Go to Page]
- 7.1 Selection and Installation. Ventilation devices and equipment serving individual dwelling units shall be tested in accordance with ANSI/ASHRAE Standard 51/AMCA 210 and ANSI/AMCA Standard 300, and rated in accordance with the airflow and sound rat...
- 7.2 Sound Ratings for Fans. Ventilation fans shall be rated for sound at no less than the minimum airflow rate required by this standard as noted below. These sound ratings shall be at a minimum of 0.1 in. of water (25 Pa) static pressure in accordan...
- 7.3 Exhaust Ducts
- 7.4 Supply Ducts. Where supply outlets are commonly ducted across multiple dwelling units, one or more supply fans located upstream of all the supply outlets shall be designed and intended to run continuously, or a system of one or more backdraft dam...
- 8. CLIMATE DATA [Go to Page]
- Figure 8-1 Climate zones for U.S. locations.
- 9. REFERENCES
- NORMATIVE APPENDIX A EXISTING BUILDINGS [Go to Page]
- A1. SUMMARY
- A2. DWELLING-UNIT MECHANICAL VENTILATION RATE
- A3. LOCAL EXHAUST [Go to Page]
- A3.1 Initial Room Airflow Deficit. The airflow deficit for each bathroom shall be 50 cfm (24 L/s), less the airflow rating from Section A4.2 of the exhaust equipment. The airflow deficit for each kitchen shall be 100 cfm (47 L/s), less the airflow ra...
- A3.2 Window Opening Credit. If the local authority having jurisdiction determines that window operation is a permissible method of providing local exhaust, the deficit may be reduced as follows: if there is an operable window in the room, the airflow...
- A3.3 Required Additional Airflow. The total airflow deficit is the sum of all the final airflow deficits from all bathrooms and kitchens. The required additional dwelling-unit mechanical ventilation airflow is equal to one-quarter of the total airflo...
- A4. AIR-MOVING EQUIPMENT [Go to Page]
- A4.1 Selection, Installation, and Sound Rating. Sections 7.1 and 7.2 are not applicable to existing local exhaust fans being retained via the alternate compliance path of this appendix.
- A4.2 Airflow Rating
- A5. DWELLING-UNIT AIR SEALING [Go to Page]
- A5.1 The spaces around readily accessible penetrations through the dwelling-unit air barrier, including but not limited to the following, shall be sealed:
- A5.2 Readily accessible leaks and gaps in the dwelling-unit air barrier shall be sealed, including but not limited to the intersections of baseboard trim and floor, the intersections of walls and ceilings, around window trim and dwelling-unit doors, ...
- A5.3 Where previously inaccessible locations are made readily accessible during renovation activities, those areas shall be air sealed as prescribed in Sections A5.1 and A5.2.
- A5.4 Sealants and materials used for air sealing shall be installed in accordance with manufacturer installation instructions, especially with respect to considerations for temperature, moisture, and gap width.
- A6. CONTROL AND OPERATION OF DWELLING-UNIT VENTILATION
- NORMATIVE APPENDIX B INFILTRATION EFFECTIVENESS WEATHER AND SHIELDING FACTORS [Go to Page]
- Table B-1 U.S. Climates (Continued)
- Table B-2 Canadian Climates (Continued)
- NORMATIVE APPENDIX C RELATIVE EXPOSURE [Go to Page]
- C1. SUMMARY [Go to Page]
- C1.1 Target Ventilation. The target ventilation (Qtot) for the relative exposure calculation is the determined by Section 4.1 without taking any infiltration credit from Section 4.1.2 but allowing for other modifications of Section 4.1.
- C1.2 Time Step. The time-step length in minutes (seconds) Dt for use in this calculation shall be no more than one hour. Scheduled or real-time quantities that are known to vary faster than the time step shall be averaged for each time step.
- C1.3 Peak Exposure Limitation. To maintain compliance with this appendix, a ventilation system and controls shall be provided such that the relative exposure (Ri) as calculated in accordance with Section C3, shall not exceed 5 for any given time step.
- C1.4 Space Volume. If the authority having jurisdiction has defined the volume of the space (Vspace), it shall be used. Otherwise, the volume of the space shall be set to the product of the floor area (Afloor) and the reference height (Hr) for the pu...
- C2. TIME-VARYING TOTAL VENTILATION [Go to Page]
- C2.1 Mechanical Ventilation. The mechanical ventilation rate (Qfan,i) shall be the larger of either the average exhaust rate from any operating device or the average supply rate from any operating device.
- C2.2 Infiltration. Either Section C2.2.1 or C2.2.2 shall be used to determine the infiltration (Qinf,i) for detached dwelling units fewer than four stories in height if a blower door test has been performed (see Section 4.1.2). For other dwelling uni...
- Table C-1 Wind-Speed Multiplier, G
- Table C-2 Shelter Factor, s
- Table C-3a (I-P) Wind Coefficient, Cw
- Table C-3b (SI) Wind Coefficient, Cw [Go to Page]
- C2.3 Combination of Infiltration and Mechanical Ventilation. The total ventilation is the sum of the mechanical ventilation and infiltration at each time step:
- Table C-4a (I-P) Stack Coefficient, Cs
- Table C-4b (SI) Stack Coefficient, Cs
- C3. RELATIVE EXPOSURE CALCULATION [Go to Page]
- C3.1 Nonzero Ventilation. The relative exposure for a given time step shall be calculated from the relative exposure from the prior step and the current ventilation using the following equation, unless the real-time or scheduled ventilation is zero:
- C3.2 Zero Ventilation. If the real-time or scheduled ventilation at a given time step is zero then the following equation shall be used:
- C3.3 Initial Conditions. Unless otherwise specified in this standard, the prior (i.e. “i – 1”) step’s relative exposure to be used in the first step’s calculation of the relative exposure shall be unity.
- INFORMATIVE APPENDIX D INFORMATIVE REFERENCES
- INFORMATIVE APPENDIX E ADDENDA DESCRIPTION INFORMATION [Go to Page]
- Table E-1 Addenda to ANSI/ASHRAE Standard 62.2-2016 (Continued) [Go to Page]