There are several environmental and facility level engineering controls that can be employed to help mitigate transmission risk. These operational improvements are often industry specific and reflect the lessons we have learned together and shared through the CWA's community calls and conversations with operators around the world.
VENTILATION AND AIR HANDLING
The American Society of Heating, Refrigerating and Air-Conditioning (ASHRAE) has made the following statement:
Consult with your HVAC engineer or facilities team to review your control systems
Consider replacing your physical filters with at least MERV 13 or 14 filters. Make sure that your system can handle the increased pressures of such filters.
Make sure your system is using as much outside air as possible. This may involve resetting the dampers on your system, or if you have an automated system a reprogramming of your automation. In either case it is best to consult with an HVAC engineer to make sure that your system can accomodate these changes.
- Reduce recirculation of air as much as possible. For simple systems this may be as adjusting your dampers to use mroe outside air, for more complex systems consult with an HVAC engineer.
- There are a number of disinfection modules that can be added to HVAC systems. UVC filters have been demonstrated to be effective for coronaviruses other than SARS-COV-2 and may be a good option. Pay attention to the replacement costs and life span of the UV bulbs. Bipolar ionizers may be effective, but there is not as much documentation to support their effectiveness.
ADVOCACY AND REOPENING GUIDELINES
As we move through the COVID-19 pandemic we are constantly learning more and many of the local guidance you have to pay attention to may evolve. The capcity limits, allowed open hours, and rules that you see from your local health authorities may change at any time. It is important to note that many of the people writing these guidelines do not know what an indoor climbing gym looks like or how it operates.