🧵 Is it enough?
"We did ventilation school assessment, we bought 2 air purifiers for each room for $40 million" "we conclude, it is safe to return."
A lot of time and money was spent. The school ventilation assessment is a great starting point, but what was the outcome?
"We did ventilation school assessment, we bought 2 air purifiers for each room for $40 million" "we conclude, it is safe to return."
A lot of time and money was spent. The school ventilation assessment is a great starting point, but what was the outcome?
https://twitter.com/BarbarossaDude/status/1428397288339218437
Ventilation assessment reports can be found here: survey.nycsca.org/files/
I looked at many classrooms. Similar findings. Most do not have outside air and problems with exhaust fans of bathrooms (unless I am missing something - no reports it was fixed?).
I looked at many classrooms. Similar findings. Most do not have outside air and problems with exhaust fans of bathrooms (unless I am missing something - no reports it was fixed?).
Most schools have windows that can be open but windows are not a reliable method to get you a specific air change rate. For more information about ventilation:
Because mechanical ventilation is not available, a good option is to add air purifiers.
https://twitter.com/marwa_zaatari/status/1383828012022439937?s=20
Because mechanical ventilation is not available, a good option is to add air purifiers.
What do we need?
Here are minimum purifiers specifications:
- Low noise
- Enough airflow to get >4 ACH (case of no OA/filters).
- Cost effective
Check tables below:
For a 900 ft2 classroom, 9 feet ceiling height.
-CADR 540 to get 4 ACH
(can be multiple air cleaners)
Here are minimum purifiers specifications:
- Low noise
- Enough airflow to get >4 ACH (case of no OA/filters).
- Cost effective
Check tables below:
For a 900 ft2 classroom, 9 feet ceiling height.
-CADR 540 to get 4 ACH
(can be multiple air cleaners)
What air purifiers were purchased?
2 air purifiers (each with CADR of 129 CFM)--->
Total CADR = 258 CFM or ~2 ACH
2 air purifiers (each with CADR of 129 CFM)--->
Total CADR = 258 CFM or ~2 ACH
https://twitter.com/marwa_zaatari/status/1426723070639751169?s=20
https://twitter.com/marwa_zaatari/status/1426723066890137602?s=20
The air purifiers purchased were not cost effective and noisy (this is subjective), noise level = 60 db .
Although a lot of effort was done, many classrooms will only have 2 ACH.
2 ACH is below the mark ⬇️
2 ACH is below the mark ⬇️
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