20 06 20 Filtration per mask and HVAC :
References below are basis for 2 simplified ASHRAE offerings:
Global Real Time Score board /Johns Hopkins University
20 05 06: Simplified report of COVID-19 pathogenesis
20 05 06 https://en.wikipedia.org/wiki/Severe_acute_respiratory_syndrome_coronavirus_2
20 02 29 https://en.wikipedia.org/wiki/Pangolin (edit/re-formatted)
The working theory of researchers in Guangzhou (S.China) is that
SARS-CoV-2 [Severe Acute Respiratory Syndrome]-[CoronaVirus-2]
originated in bats and, prior to infecting humans,
was circulating among pangolins. (most trafficked/slaughtered animal in the world.) [46
The illicit Chinese (and others) trade of pangolins for use in traditional Chinese medicine
(and other human drivers ) is suggested as a
vector (carrier) to humans who deliver to other humans (transmission).
Pangolins (eventually ruled out as the definitive source),
serve as the carriers
for virus jumping from bats > to pangolins > to humans.
99% match did not actually refer to the entire genome,
but to a specific site known as the receptor-binding domain (RBD).
(whole-genome comparison had found that the
pangolin and human viruses share only 90.3% of their DNA;
(at least 99.8% is needed for a conclusive match)
Ecologists worried that the early speculation about pangolins being the source
may have led to mass slaughters, endangering the innocent animals further,
which was similar to what happened to civets during the SARS outbreak.
:j: so, if pangolins do not succumb to the bat virus,
what immunity do they have ?
that humans do not ??
Further, would humans please consider not strangling
their Mother Earth that is dying by humans stupidity.
You go Greta Thunder !!!