Preventing Airborne Disease Transmission: Review of Methods for Ventilation Design in Health Care Facilities

Table 10

MERV Rating.

MERV	Typical controlled contaminant [μm]	Dust spot efficiency [%]	Arrestance [%]
17–20	<0.3	NA^1	NA
13–16	0.3–1.0	>90	>98
9–12	1.0–3.0	>40	>90
5–8	3.0–10	>20	>80
1–4	>10	>20	>65

𝟏NA: not applicable.