Brutkey

David Elfstrom
@DavidElfstrom@masto.ai
5a3d184dfc3dd210.mp4 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 57cc8192019f0b4c.png 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 df4a1ab7a152cf17.jpeg