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jsherman256 / keybase.md
Created June 10, 2020 09:31

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@jsherman256
jsherman256 / in-out.md
Created January 10, 2023 07:52

First, there are [3 science based methods]({{<relref "methods">}}) to clean the air:

  • Ventilation - bringing in outdoor air
  • Filtration - filtering particles from the air
  • UV - killing microbes with UV light

These can be done in-room and out-of-room (in the HVAC unit).

In-Room Mitigation

Ventilation:

@jsherman256
jsherman256 / masks-vs-ventilation.md
Created January 10, 2023 08:26
Equivalent CFM
Ventilation CFM in Classroom 100 250 400 500
Leakage %
Cloth Mask .75 33 83 133 167
2-way Cloth .56 78 194 311 389
Surgical .5 100 250 400 500
2-way Surgical .25 300 750 1200 1500
Non-Fit-Test Respirator .2 400 1000 1600 2000
2-way NFT Respirator .04 2400 6000 9600 12000
@jsherman256
jsherman256 / air-cleaners-vs-hepa.md
Created January 11, 2023 09:53
Air Changes % Reduction
1 63
2 86
3 95
4 98
5 99.3
6 99.7
10 99.995
15 99.99997
@jsherman256
jsherman256 / what-should-your-co2-be.md
Created January 11, 2023 11:29
Low activity adults High activity adults Low activity children High activity children
CO₂ (ppm) LPS CFM LPS CFM LPS CFM LPS CFM
600 30.0 63.3 85.6 180.5 19.4 41.0 55.6 117.2
700 19.3 40.7 55.0 116.1 12.5 26.4 35.7 75.4
800 14.2 30.0 40.5 85.5 9.2 19.4 26.3 55.5
900 11.3 23.7 32.1 67.7 7.3 15.4 20.8 44.0
1000 9.3 19.6 26.6 56.0 6.0 12.7 17.2 36.4
1100 7.9 16.8 22.6 47.8 5.1 10.9 14.7 31.0
1200 6.9 14.6 19.7 41.7 4.5 9.5 12.8 27.1
@jsherman256
jsherman256 / calculating-ventilation-from-co2_pt1.md
Created January 11, 2023 11:41
Activity M (met) Range
Calisthenics--light effort 2.8
Calisthenics--moderate effort 3.8
Calisthenics--vigorous effort 8
Child care 2.0 to 3.0
Cleaning, sweeping--moderate effort 3.8
Custodial work--light 2.3
Dancing--aerobic, general 7.8
Health club exercise classes--general 5
@jsherman256
jsherman256 / calculating-ventilation-from-co2_pt2.md
Created January 11, 2023 11:44
Low activity adults High activity adults Low activity children High activity children
CO₂ (ppm) LPS CFM LPS CFM LPS CFM LPS CFM
600 30.0 63.3 85.6 180.5 19.4 41.0 55.6 117.2
700 19.3 40.7 55.0 116.1 12.5 26.4 35.7 75.4
800 14.2 30.0 40.5 85.5 9.2 19.4 26.3 55.5
900 11.3 23.7 32.1 67.7 7.3 15.4 20.8 44.0
1000 9.3 19.6 26.6 56.0 6.0 12.7 17.2 36.4
1100 7.9 16.8 22.6 47.8 5.1 10.9 14.7 31.0
1200 6.9 14.6 19.7 41.7 4.5 9.5 12.8 27.1