ASHRAE Journal - January 2021 - 63

COLUMN IEQ APPLICATIONS

Example Application of FaTIMA
FaTIMA was used to evaluate the effect of face coverings (masks) and HVAC-related controls in a classroom
for children ages 5 to 8 years.13 In this example, the
integrated exposure was modeled for a single contagious
occupant (modeled as a continuous source from 9 a.m.
to 3 p.m.) in a classroom ventilated according to ANSI/
ASHRAE Standard 62.1-2019, Ventilation and Acceptable
Indoor Air Quality. The space was assumed to be served by
a terminal unit with a 70% recirculation rate and a MERV
6 filter. Simulations were performed for 1 µm aerosols to
evaluate the following control methods separately and in
combination: face coverings with a 30% filter efficiency,
MERV 13 filtration, and a portable air cleaner (PAC) with
a clean air delivery rate (CADR) of 142 L/s (300 cfm).
Scenarios implementing these controls were compared
to the baseline case by dividing their integrated exposure
by that of the baseline case to calculate a normalized integrated exposure (NIE) as shown in Figure 4. For example,
face coverings resulted in an NIE of 0.49, meaning the
exposure over the 6 hour period was reduced by approximately 50%. Figure 4 shows that increasing to MERV 13 filtration also reduced exposure by approximately 50% and
that the PAC reduced exposure by 40%. A larger capacity
PAC unit could reduce exposure further. When combined
with face coverings, each of the two filtration controls
reduced exposure by over 70%.
FaTIMA can be accessed here: https://pages.nist.gov/
CONTAM-apps/webapps/FaTIMA/index.html. A report
providing more detail on the tool,1 including a user
guide, is here: https://doi.org/10.6028/NIST.TN.2095.
Readers are encouraged to explore the tool and use it to
study the relative effectiveness of control measures for
microbiological aerosols in indoor spaces. Plans exist to

FIGURE 4 NIE results for example case.

1.4
1.2
NIETU,nocontrols

exposure period and the full 24-hour simulation period.
A set of summary pie charts presents the numerical
results visually to show relative values related to fate,
source, surface deposition and filtration.
After a simulation is complete, the user can download
a CONTAM project file and a comma-separated value
(CSV) file containing the inputs and simulation results.
A spreadsheet is provided into which the CSV file can be
imported to allow comparisons between different scenarios. For those familiar with CONTAM, the project file can
be used directly in CONTAM, which allows the exercise of
CONTAM capabilities not implemented in FaTIMA.

1.00

1.0
0.8
0.6

0.49

0.60

0.51

0.4
0.2
0.0

0.29

0.25
No Control

Face
Coverings

MERV 13

PAC
MERV 13
(300 CADR) + Face
Coverings

PAC
+ Face
Coverings

further develop the tool; suggestions are welcome and
can be sent to the authors at NIST.

References

1. Dols, W.S., B.J. Polidoro, D. Poppendieck, S.J. Emmerich. 2020.
A Tool to Model the Fate and Transport of Indoor Microbiological Aerosols
(FaTIMA). National Institute of Standards and Technology.
2. Zhu, S., S. Kato, J.-H. Yang. 2006. " Study on transport
characteristics of saliva droplets produced by coughing in a calm
indoor environment. " Building and Environment 41(12): 1691-1702.
3. Dols, W.S., B.J. Polidoro. 2015. CONTAM User Guide and Program
Documentation. National Institute of Standards and Technology.
4. Grot, R.A., A.K. Persily. 1986. " Measured air infiltration and
ventilation rates in eight large office buildings. " In Measured Air
Leakage of Buildings, ed. H. Trechsel and P. Lagus. ASTM International.
5. Persily, A.K., L.K. Norford. 1987. " Simultaneous measurements
of infiltration and intake in an office building. " ASHRAE Transactions
93(2):942-56.
6. Ng, L.C., N.O. Quiles, W.S. Dols, S.J. Emmerich. 2018. " Weather
correlations to calculate infiltration rates for U.S. commercial
building energy models. " Building and Environment 127:47-57.
7. Kowalski, W.J., W.P. Bahnfleth, T.S. Whittam. 1999. " Filtration
of airborne microorganisms: modeling and prediction. " ASHRAE
Transactions 105(2):4-17.
8. Duguid, J.P. 1946. " The size and the duration of air-carriage of
respiratory droplets and droplet-nuclei. " Epidemiology and Infection
44(6):471-79.
9. Milton, D.K., M.P. Fabian, B.J. Cowling, M. L. Grantham, et al.
2013. " Influenza virus aerosols in human exhaled breath: particle
size, culturability, and effect of surgical masks. " PLoS Pathogens
9(3):e1003205.
10. Leconte, S., G. Liistro, P. Lebecque, J.-M. Degryse. 2011. " The
objective assessment of cough frequency: accuracy of the LR102
device. " Cough 7(1):11.
11. Lindsley, W.G., et al. 2010. " Measurements of airborne influenza
virus in aerosol particles from human coughs. " PLoS One 5(11):e15100.
12. Lai, A.C.K., W.W. Nazaroff. 2000. " Modeling indoor particle
deposition from turbulent flow onto smooth
surfaces. " Journal of Aerosol Science 31(4):463-76.
13. Ng, L.C., D.G. Poppendieck, B.J. Polidoro,
W.S. Dols, et al. 2020. " Simulation of controls for
reducing aerosol exposure in educational spaces
using FaTIMA. " National Institute of Standards https://bit.ly/3khhdC5
Rate this Column
and Technology.
JAN UARY 2021

ashrae.org

ASHRAE JOURNAL

63


https://pages.nist.gov/CONTAM-apps/webapps/FaTIMA/index.html https://pages.nist.gov/CONTAM-apps/webapps/FaTIMA/index.html https://www.doi.org/10.6028/NIST.TN.2095 https://www.bit.ly/3khhdC5 http://www.ashrae.org

ASHRAE Journal - January 2021

Table of Contents for the Digital Edition of ASHRAE Journal - January 2021

Contents
ASHRAE Journal - January 2021 - Intro
ASHRAE Journal - January 2021 - Cover1
ASHRAE Journal - January 2021 - Cover2
ASHRAE Journal - January 2021 - 1
ASHRAE Journal - January 2021 - 1a
ASHRAE Journal - January 2021 - 1b
ASHRAE Journal - January 2021 - Contents
ASHRAE Journal - January 2021 - 3
ASHRAE Journal - January 2021 - 4
ASHRAE Journal - January 2021 - 5
ASHRAE Journal - January 2021 - 6
ASHRAE Journal - January 2021 - 7
ASHRAE Journal - January 2021 - 8
ASHRAE Journal - January 2021 - 9
ASHRAE Journal - January 2021 - 10
ASHRAE Journal - January 2021 - 11
ASHRAE Journal - January 2021 - 12
ASHRAE Journal - January 2021 - 13
ASHRAE Journal - January 2021 - 14
ASHRAE Journal - January 2021 - 15
ASHRAE Journal - January 2021 - 16
ASHRAE Journal - January 2021 - 17
ASHRAE Journal - January 2021 - 18
ASHRAE Journal - January 2021 - 19
ASHRAE Journal - January 2021 - 20
ASHRAE Journal - January 2021 - 21
ASHRAE Journal - January 2021 - 22
ASHRAE Journal - January 2021 - 23
ASHRAE Journal - January 2021 - 24
ASHRAE Journal - January 2021 - 25
ASHRAE Journal - January 2021 - 26
ASHRAE Journal - January 2021 - 27
ASHRAE Journal - January 2021 - 28
ASHRAE Journal - January 2021 - 29
ASHRAE Journal - January 2021 - 30
ASHRAE Journal - January 2021 - 31
ASHRAE Journal - January 2021 - 32
ASHRAE Journal - January 2021 - 33
ASHRAE Journal - January 2021 - 34
ASHRAE Journal - January 2021 - 35
ASHRAE Journal - January 2021 - 36
ASHRAE Journal - January 2021 - 37
ASHRAE Journal - January 2021 - 38
ASHRAE Journal - January 2021 - 39
ASHRAE Journal - January 2021 - 40
ASHRAE Journal - January 2021 - 41
ASHRAE Journal - January 2021 - 42
ASHRAE Journal - January 2021 - 43
ASHRAE Journal - January 2021 - 44
ASHRAE Journal - January 2021 - 45
ASHRAE Journal - January 2021 - 46
ASHRAE Journal - January 2021 - 47
ASHRAE Journal - January 2021 - 48
ASHRAE Journal - January 2021 - 49
ASHRAE Journal - January 2021 - 50
ASHRAE Journal - January 2021 - 51
ASHRAE Journal - January 2021 - 52
ASHRAE Journal - January 2021 - 53
ASHRAE Journal - January 2021 - 54
ASHRAE Journal - January 2021 - 55
ASHRAE Journal - January 2021 - 56
ASHRAE Journal - January 2021 - 57
ASHRAE Journal - January 2021 - 58
ASHRAE Journal - January 2021 - 59
ASHRAE Journal - January 2021 - 60
ASHRAE Journal - January 2021 - 61
ASHRAE Journal - January 2021 - 62
ASHRAE Journal - January 2021 - 63
ASHRAE Journal - January 2021 - 64
ASHRAE Journal - January 2021 - 65
ASHRAE Journal - January 2021 - 66
ASHRAE Journal - January 2021 - 67
ASHRAE Journal - January 2021 - 68
ASHRAE Journal - January 2021 - 69
ASHRAE Journal - January 2021 - 70
ASHRAE Journal - January 2021 - 71
ASHRAE Journal - January 2021 - 72
ASHRAE Journal - January 2021 - 73
ASHRAE Journal - January 2021 - 74
ASHRAE Journal - January 2021 - 75
ASHRAE Journal - January 2021 - 76
ASHRAE Journal - January 2021 - 77
ASHRAE Journal - January 2021 - 78
ASHRAE Journal - January 2021 - 79
ASHRAE Journal - January 2021 - 80
ASHRAE Journal - January 2021 - 81
ASHRAE Journal - January 2021 - 82
ASHRAE Journal - January 2021 - 83
ASHRAE Journal - January 2021 - 84
ASHRAE Journal - January 2021 - 85
ASHRAE Journal - January 2021 - 86
ASHRAE Journal - January 2021 - 87
ASHRAE Journal - January 2021 - 88
ASHRAE Journal - January 2021 - 89
ASHRAE Journal - January 2021 - 90
ASHRAE Journal - January 2021 - 91
ASHRAE Journal - January 2021 - 92
ASHRAE Journal - January 2021 - 93
ASHRAE Journal - January 2021 - 94
ASHRAE Journal - January 2021 - 95
ASHRAE Journal - January 2021 - 96
ASHRAE Journal - January 2021 - 97
ASHRAE Journal - January 2021 - 98
ASHRAE Journal - January 2021 - 99
ASHRAE Journal - January 2021 - 100
ASHRAE Journal - January 2021 - 101
ASHRAE Journal - January 2021 - 102
ASHRAE Journal - January 2021 - 103
ASHRAE Journal - January 2021 - 104
ASHRAE Journal - January 2021 - 105
ASHRAE Journal - January 2021 - 106
ASHRAE Journal - January 2021 - 107
ASHRAE Journal - January 2021 - 108
ASHRAE Journal - January 2021 - 109
ASHRAE Journal - January 2021 - 110
ASHRAE Journal - January 2021 - 111
ASHRAE Journal - January 2021 - 112
ASHRAE Journal - January 2021 - Cover3
ASHRAE Journal - January 2021 - Cover4
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_VJKSRY
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SDHUTC
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JPPKRR
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SDLTTH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_CKLLES
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SLDOX
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_HJETUK
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OLUHGE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2020october
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2020october_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ZERDGH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QVMNEO
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RTPOKE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_BBATRE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_STUBMW
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_TPEMPE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JNMKDS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_FBTTPA
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_WQMMNE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_TVBRYN
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_showguide2020
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_KTUZMA
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ABEDGD
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201910
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201909
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2019septmeber_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2019september
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201908
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201907
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201906
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201905
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201904
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2019april
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201903
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2019march
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201902
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201901
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_showguide2019
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018december
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2018fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2018fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018october
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2018
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201810
https://www.nxtbook.com/nxtbooks/ashrae/ashraeinsights_201806
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201805
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201804
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201803
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201712
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201711
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201710
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2017fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2017fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201709
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201705
https://www.nxtbook.com/nxtbooks/ashrae/ashrae_meetinginsert_201610
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2016fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2016fall
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acrexindia
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2015summer_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2015summer
https://www.nxtbook.com/nxtbooks/amca/2014summer2
https://www.nxtbook.com/nxtbooks/amca/2014summer
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acma_2014summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201311
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201309
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acmasupp_2013fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201305
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201303
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2013winter
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201211
https://www.nxtbook.com/nxtbooks/ashrae/achr_expo_mexico2012
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201209
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201208_v3
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201208_v2
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2012summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201205
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201203
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2012winter
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201111_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201109_v2
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2011summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201105
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201103
https://www.nxtbookmedia.com