ASHRAE Standard 62.2 2022

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ASHRAE Standard 62.2-2022 — Ventilation and Acceptable Indoor Air Quality in Residential Buildings- (ANSI Approved)

Published By	Publication Date	Number of Pages
ASHRAE	2022

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Description

This revised 2022 edition of Standard 62.2 adds a compliancepath that gives credit for particle filtration, distinguishing between balancedand unbalanced ventilation system interactions with natural infiltration, requiringcompartmentalization limits for new multifamily dwellings, and allowing forsingle-point envelope leakage test results to be used when calculatinginfiltration credit.Standard 62.2 defines the roles of and minimum requirements formechanical and natural ventilation systems and the building envelope intendedto provide acceptable indoor air quality in low-rise residential buildings. Asin the previous editions of this standard, there are three primary sets ofrequirements and a number of secondary ones. The three primary sets involvewhole-building ventilation, local demand-controlled exhaust, and sourcecontrol. The secondary requirements focus on properties of specific itemsneeded to achieve the main objectives of the standard. Standard 62.2 applies tospaces intended for human occupancy within single-family houses and multifamilystructures, including manufactured and modular houses. This standard does notapply to transient housing such as hotels, motels, nursing homes, dormitories,or jails.The standard considers chemical, physical, and biologicalcontaminants that can affect air quality. It does not address thermal comfortrequirements, specific pollutant concentration levels, or certain potentialpollutant sources such as unvented combustion space heaters and contaminationfrom outdoor sources or from episodic occupant-controlled events such aspainting, smoking, cleaning, or other high-polluting events.

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PDF Pages	PDF Title
1	ANSI/ASHRAE Standard 62.2-2022
3	Contents
4	Foreword 1. Purpose 2. Scope 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 3.1 Terms
6	3.2 Initialisms, Abbreviations, and Acronyms
7	4. Dwelling-Unit Ventilation 4.1 Ventilation Rate. A mechanical exhaust system, supply system, or combination thereof shall be designed and provided with the capacity to deliver outdoor air ventilation to the whole dwelling unit at a continuous rate not less than that specified …
11	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. Exhaust-only ventilation systems are not permitted for newly constructed attached dwelling units t… 4.3 Airflow Measurement. The mechanical ventilation airflows required by this section shall be measured according to the ventilation equipment manufacturer installation instructions, or by using a flow hood, flow grid, or other airflow measuring devi… 4.4 Control. An on-off control readily accessible to the dwelling-unit occupant, including but not limited to a fan switch or a dedicated branch-circuit overcurrent device, shall be provided. 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…
12	5. Local Exhaust 5.1 Local Mechanical Exhaust. A local mechanical exhaust system shall be designed and installed in each kitchen and bathroom and shall be one of either 5.2 Demand Controlled Local Mechanical Exhaust. A demand controlled local mechanical exhaust system shall be designed to comply with the requirements of the following subsections.
13	5.3 Continuous Local Mechanical Exhaust. A continuous local mechanical exhaust system shall be designed and installed. 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 6.1 Adjacent Spaces and Transfer Air. Measures shall be taken to minimize air movement across the dwelling-unit boundary from adjacent spaces, such as garages, unconditioned crawlspaces, unconditioned attics, and other dwelling units. Dwelling-unit b… 6.2 Labeling. Controls shall be labeled as to their function (unless that function is obvious, such as toilet exhaust fan switches). 6.3 Clothes Dryers. Clothes dryers shall be exhausted directly to the outdoors.
14	6.4 Combustion and Solid-Fuel-Burning Appliances 6.5 Ventilation Opening Area. Spaces shall have ventilation openings as listed in the following subsections. Such openings shall meet the requirements of Section 6.6. 6.6 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 … 6.7 Minimum Filtration. Mechanical systems that supply air to the dwelling unit 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 design…
15	6.8 Carbon Monoxide Alarms. A carbon monoxide alarm shall be installed in each dwelling unit in accordance with NFPA 72, National Fire Alarm and Signaling Code, and shall be consistent with requirements of applicable laws, codes, and standards. 7. Air-Moving Equipment 7.1 Ratings. Airflow and sound ratings shall be provided for ventilation devices and equipment serving individual dwelling units. Airflow and sound ratings shall be provided in accordance with HVI 920, or equivalent, by an administration and certific… 7.2 Installation. Installations of systems or equipment shall be carried out in accordance with manufacturer’s design requirements and installation instructions. 7.3 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… 7.4 Exhaust Ducts 7.5 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. Operations and Maintenance 8.1 Operations
16	8.2 Maintenance
17	9. Climate Data
18	10. References
20	Normative Appendix A: Existing Buildings A1. Summary A2. Dwelling-Unit Mechanical Ventilation Rate A2.1 Control. The control required by Section 4.4 shall be accessible to the dwelling-unit occupant but shall not be required to be readily accessible to the dwelling-unit occupant. A3. Local Exhaust 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 AHJ 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 deficit may be reduced by… 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 A4.1 Selection, Installation, and Sound Rating. Sections 7.1, 7.2, and 7.3 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
21	A5.1 The spaces around accessible penetrations through the dwelling-unit boundary, including but not limited to the following, shall be sealed: A5.2 Accessible leaks and gaps in the dwelling-unit boundary 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, and the ter… A5.3 Where previously inaccessible locations are made 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
22	Normative Appendix B: Infiltration Effectiveness Weather and Shielding Factors
50	Normative Appendix C: Relative Exposure C1. Summary 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 AHJ 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 purposes of this appendix (s… C2. Time-Varying Total Ventilation 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…
51	C2.3 Combination of Infiltration and Mechanical Ventilation. The total ventilation is the sum of the mechanical ventilation and infiltration at each time step:
52	C3. Relative Exposure Calculation 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.
53	Informative Appendix D: Informative References
54	Informative Appendix E: Addenda Description

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Standard Title	ASHRAE Standard 62.2-2022 — Ventilation and Acceptable Indoor Air Quality in Residential Buildings- (ANSI Approved)
Published Code	ASHRAE
Publication Date	2022

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ASHRAE Standard 62.2 2022

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