[NOTE: This document is not the current version of ASHRAE Standard 62.2-2016. This unofficial version of Standard 62.2 was prepared by ASHRAE for the 2019 update to the California Building Energy Efficiency Standards (California Code of Regulations, Title 24, Part 6).Section 150.0(o) of the 2019 California Building Energy Efficiency Standards also specifies amendments to this version of ANSI/ASHRAE Standard 62.2-2016, which are required for compliance in California.To purchase the most recent, official version of ANSI/ASHRAE Standard 62.2-2016, visit https://www.ashrae.org/bookstore and search for keyword 86198.]

Major Scope Changes and More in Standard 62.2-2016

The 2016 edition of ANSI/ASHRE Standard 62.2 makes two major changes to scope by including unvented space heaters as a potential contaminant source and by expanding "covered dwellings" to include all multifamily dwelling units. A number of other significant changes are also incorporated. A minimal calculated mechanical ventilation rate is provided for existing buildings, below which installation of whole-house ventilation is not required; a distinction is now made between range hoods and other kitchen ventilation options; new methods are provided for determining an infiltration credit for horizontally attached multifamily dwelling units and for determining requirements for a variety of noncontinuous ventilation strategies; and a maximum short-term relative exposure limit is implemented for the first time.Standard 62.2 defines the roles of and minimum requirements for mechanical and natural ventilation systems and the building envelope intended to provide acceptable indoor air quality in low-rise residential buildings. As in the previous editions of this standard, there are three primary sets of requirements and a number of secondary ones. The three primary sets involve whole-building ventilation, local demand-controlled exhaust, and source control. The secondary requirements focus on properties of specific items needed to achieve the main objectives of the standard. Standard 62.2 applies to spaces intended for human occupancy within single-family houses and multifamily structures, including manufactured and modular houses. This standard does not apply to transient housing such as hotels, motels, nursing homes, dormitories, or jails.The standard considers chemical, physical, and biological contaminants that can affect air quality. It does not address thermal comfort requirements, specific pollutant concentration levels, or certain potential pollutant sources such as unvented combustion space heaters and contamination from outdoor sources or from episodic occupant-controlled events such as painting, smoking, cleaning, or other high-polluting events.The PDF download of Standard 62.2, in addition to offering immediate access to the content, presents the climate zone map in color for enhanced readability.