@DavidElfstrom@masto.ai

For #TwitterMigration my #DoAllTheThings infographic and hashtags for #engineering controls in a small commercial building to address #COVIDisAirborne:

#maskup #respirators #N95 #ventilation #filtration #IAQ #HEPA #CorsiRosenthalBox #UVGI #FarUVC #CO2 #COVIDCO2

Small commercial building schematic with labels
By @DavidElfstrom
Maximize outdoor air damper position and economizer function
Higher MERV filter rating, ensure no bypass
Properly tension fan belt
Exhaust fan functioning
Dotted box surrounding: Regular inspection, maintenance, filter changes
Windows partially open
Upper room UVGI (Ultraviolet Germicidal Irradiation)
IAQ monitor with action limits: Temperature, Relative Humidity, Carbon Dioxide, Particulate Matter
HEPA or Corsi-Rosenthal box in center of room
Respirator on person for source control & PPE
Fan control changed from Auto to ON

David Elfstrom
@DavidElfstrom@masto.ai

How much air backwash are you inhaling from others? A CO₂ meter will tell you! Here is how to determine the rebreathed fraction of air.
#COVIDCO2 #ventilation

$Rebreathed CO2 Breath approximately 40,000 ppm Outdoors 400 ppm For every +400 ppm rebreathed fraction +1% 800 ppm = 1%, 1 in 100 breaths 1200 ppm = 2%, 1 in 50 breaths 2400 ppm = 5%, 1 in 20 breaths 5000 ppm = 12%, 1 in 8 breaths$

David Elfstrom
@DavidElfstrom@masto.ai

Here. Have a thermal video of my cat leaving behind a warm butt print.

May it distract you from both the cold and the ICE. #caturday

David Elfstrom
@DavidElfstrom@masto.ai

How much air backwash are you inhaling from others? A CO₂ meter will tell you! Here is how to determine the rebreathed fraction of air.
#COVIDCO2 #ventilation

$Rebreathed CO2 Breath approximately 40,000 ppm Outdoors 400 ppm For every +400 ppm rebreathed fraction +1% 800 ppm = 1%, 1 in 100 breaths 1200 ppm = 2%, 1 in 50 breaths 2400 ppm = 5%, 1 in 20 breaths 5000 ppm = 12%, 1 in 8 breaths$

David Elfstrom
@DavidElfstrom@masto.ai

For #TwitterMigration my #DoAllTheThings infographic and hashtags for #engineering controls in a small commercial building to address #COVIDisAirborne:

#maskup #respirators #N95 #ventilation #filtration #IAQ #HEPA #CorsiRosenthalBox #UVGI #FarUVC #CO2 #COVIDCO2