A facility shall have a ventilation system using a recirculated central air system equipped with a minimum of two filter beds. Filter bed number one must be located upstream of the conditioning equipment and must have a minimum efficiency of thirty percent. Each supply air unit must have filters that are at least thirty percent effective. Each central ventilation system must have filters that are at least eighty percent effective. Each common use area must have filters that are eighty percent effective on an air supply system. Each air supply system serving solely an administrative area must have filters that are at least thirty percent effective. These filter efficiencies must be warranted by the manufacturer and must be based on the 2017 edition of the American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) Standard 52.2 dust spot test method with atmospheric dust. Each filter frame must be durable and carefully dimensioned and shall provide an airtight fit with the enclosing duct work. Each joint between filter segments and the enclosing duct work must be gasketed or sealed to provide a positive seal against air leakage. A manometer must be installed across each filter bed serving a central air system.

Reference: ASHRAE 52.2, 2017 edition, American Society of Heating, Refrigeration, and Air Conditioning Engineers. Copies may be obtained at no cost at https://www.ashrae.org/File%20Library/Technical%20Resources/COVID-19/52_2_2017_COVID-19_20200401.pdf.

Source: 42 SDR 51, effective October 13, 2015 ; 50 SDR 62, effective November 27, 2023 .

General Authority: SDCL 34-12-13 (1)(3)(4).

Law Implemented: SDCL 34-12-13 .

Prior versions effective: 2015-10-13.