Table 1 Air Exchanges per Hour for each ICU in normal and negative configurations. The UWMC maintenance department provided the ACR rates.

From: Assessment of aerosol persistence in ICUs via low-cost sensor network and zonal models

ICU

Area (m2/ft2)

Height (m/ft)

Antechamber

Air Exchanges Per Hour (ACR)

Normal Configuration

Negative Pressure

ICU 1

21.0 / 226

2.9 / 9.5

Yes

8.10

− 17.36

ICU 2

21.0 / 226

2.9 / 9.5

Yes

12.61

N/A

ICU 3

21.3 / 229

2.9 / 9.5

Yes

6.97

− 9.46

ICU 4

24.9 / 268

2.9 / 9.5

No

11.47

N/A

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