Assessment and mitigation of aerosol airborne SARS-CoV-2 transmission in laboratory and office environments

Figures & data

Table 2. Typical values assumed for office vs. laboratory spaces.

Parameter	Meaning	Value [Office]	Value [Laboratory]
$V_{\mathit{room}}$	Room volume	80,000 L	200,000 L
$f$	Filtration efficiency	0%	99.97%
$q=1-f$	Filter penetration	1	$3\times {10}^{-4}$
$\mathit{ACH}$	Air changes per hour	–	∼12
FCH	Fresh air changes per hour	∼2	–

Figure 1. Example room configurations for (a) laboratory and (b) office settings. In the laboratory shown, two work spaces are identified with negligible mixing of air between them. Each work space has a separate AHU with fresh air output and HEPA-filtered recirculation. In the office, the presence of one worker precludes workers in other areas, and recirculated air is not filtered. Both rooms are held at positive pressure.

Table 1. Values of model parameters assumed for example risk calculations.

Parameter	Meaning	Value
$D_{\mathit{mask}}$ (N95)	N95 filter efficiency (single wearer)	0.1
$D_{\mathit{mask}}$ (surgical)	Surgical mask filter efficiency (single wearer)	0.5
$q=1-f$	HEPA filter penetration	$3\times {10}^{-4}$
$k$	Single-pathogen infection parameter	100