Building Ventilation & Portable Air Purifiers

Building Ventilation:

During smoke events, LBNL Guidance / Response Actions by AQI Level may trigger the LBNL Facilities Division to reduce infiltration of smoke into buildings by adjusting building HVAC systems when outdoor AQI levels begin to approach 100. This specifically consists of shutting down economizers and reducing outdoor air dampers to their minimum position. It has been determined that these protocols will not compromise ventilation related COVID-19 controls. The complete description of the protocol can be found here. Additionally, the Sustainable Berkeley Lab Group created tools for aiding in initiating response actions which can be found here. 

Building Filtration:

Another key engineering control to improve indoor air quality during smoke events consists of air filtration through building air handling systems for both 100% outside air and recirculated air systems. Most LBNL buildings contain air filter media ranging from Minimum Efficiency Rating Value of 8-13 (MERV8-13).  MERV8 filters are typically installed on smaller, single filter units, and MERV13 (or better) filters are typically found on multiple filter units.  The long term goal is to upgrade all systems to MERV14 minimum which is currently in progress. If you choose to relocate to an LBNL building with a lower AQI level during a smoke event, view the PurpleAir sensor data for the particular building first to ensure the AQI level is lower (preferably below 100). Factors to consider are ensuring you select a SAFE building, you have card key access, there are open hotel spaces, break room, or conference room spaces. Examples of SAFE buildings that tend to have lower AQI levels with possible, open work spaces are: B91 (IGB), B59 (CRT), B30, B33, B74, B15, and B76. At least one SAFE building has been identified for each Laboratory site zone.

Portable Air Purifiers:

Other ways to potentially reduce indoor particulate levels and improve indoor air quality while working onsite or at offsite, leased facilities include the use of a portable air purifier in your office to maintain comfort. EHS-approved air purifiers are available on eBuy; for easy access use these purchasing instructions. Air purifiers must use mechanical filtration only and blow air in an upward direction. In addition, they must be NRTL-listed, CARB-certified (California Air Resources Board), and ENERGY STAR certified.  

Prior to using the air purifier, refer to this document for guidance on proper placement due to COVID protocols/concerns. Contact your assigned EHS health and safety representative for assistance, if needed. Be sure to maintain the air purifier according to manufacturer requirements.