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// CODE SNIPPET

403.9.2 Class 2 Air

California Mechanical Code 2019 > 4 Ventilation Air > 403.0 Ventilation Rates > 403.9 Air Classification and Recirculation > 403.9.2 Class 2 Air
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Recirculation of Class 2 air within the space of origin shall be permitted. Recirculation or transfer of Class 2 air to other Class 2 or Class 3 spaces shall be permitted, provided the other spaces are used for the same or similar purpose or task and involve the same or similar pollutant sources as the Class 2 space. Transfer of Class 2 air to toilet rooms shall be permitted. Recirculation or transfer of Class 2 air to Class 4 spaces shall be permitted. Class 2 air shall not be recirculated or transferred to Class 1 spaces. Where using an energy recover device, recirculation from leakage, carryover, or transfer from the exhaust side of the energy recovery device shall be permitted and the recirculated Class 2 air shall not exceed 10 percent of the outdoor air intake flow. [ASHRAE 62.1:5.16.3.2]

Related Code Sections


403.9.2 Ventilation Air, Class 2 Air
Recirculation of Class 2 air within the space of origin shall be permitted. Recirculation or transfer of Class 2 air to other Class 2 or Class 3 ...
California Mechanical Code 2016 > 4 Ventilation Air > 403.0 Ventilation Rates > 403.9 Air Classification and Recirculation > 403.9.2 Class 2 Air
403.9.2 Ventilation Air, Class 2 Air
Recirculation of Class 2 air within the space of origin shall be permitted. Recirculation or transfer of Class 2 air to other Class 2 or Class 3 ...
California Mechanical Code 2019 > 4 Ventilation Air > 403.0 Ventilation Rates > 403.9 Air Classification and Recirculation > 403.9.2 Class 2 Air
Section 12-71-100 Air Filters,
Classification. As a result of the tests, air filter units are classified as Class 1 or 2 as indicated below: Class 1 air filter units are those ...
California Referenced Standards Code 2016 > 12-71 Air Filters > 12-71-100
Section 12-71-100 Air Filters,
Classification. As a result of the tests, air filter units are classified as Class 1 or 2 as indicated below: Class 1 air filter units are those ...
California Referenced Standards Code 2019 > 12-71 Air Filters > 12-71-100
Section 120.1 Nonresidential, High-Rise Residential Hotel/Motel Occupancies, and Covered Processes — Mandatory Requirements, Requirements for Ventilation and Indoor Air Quality
or transfer of Class 1 air to any space shall be permitted; [ASHRAE 62.1:5.16.3.1] Class 2 air. Recirculation or transfer of Class 2 air shall ...
California Energy Code 2019 > 3 Nonresidential, High-Rise Residential Hotel/Motel Occupancies, and Covered Processes — Mandatory Requirements > 120.1 Requirements for Ventilation and Indoor Air Quality
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