In this weeks update Dr. Nick van Terheyden and I discuss the virulence of the virus as well as the differences between New Zealand and Brazil.  I then get into a deeper dive on filtration systems, the ASHRAE standards, and what to look for in filters including MERV, and the various standards.
 
[youtube https://www.youtube.com/watch?v=sT0vGlaeJuc&w=560&h=315]