JULY 26, 2021—Ontario Society of Professional Engineers @O_S_P_E calls upon @sflecce & @ONgov to immediately consult with subject matter experts and address #airborne transmission in schools before more outbreaks occur: ospe.on.ca/advocacy/engin… /1
"Engineers know if we are going to combat the Delta and future variants and a potential fourth wave, the need for proper ventilation and filtration of indoor air is paramount" says @O_S_P_E. /2
"Engineers know that air quality is bigger than COVID-19" says @O_S_P_E.

"The cost of investment is small compared to the benefits we will reap in finance, health and wellness" /3
Engineers have a duty to the public welfare. We have long been essential public health partners through water & wastewater infrastructure for sanitation. The same is needed for indoor air across all building types. /4
Illogical, uninformed, and contradictory measures from some Infection Prevention and Control practitioners and Infectious Disease physicians continue to delay the selection, implementation, and funding of effective engineering controls. /5
Professional Engineers have a legislated responsibility to the public welfare. We have a duty to report. And we are speaking up. /6
It's up to the decision makers to heed the warnings, or not. It was engineers that warned NASA management about the dangers of launching the Challenger space shuttle on January 28, 1986.

Engineers say #COVIDisAirborne. Include them when developing safety plans.
/7
In January, OSPE called on @ONgov to address airborne transmission. /8
And then in April, OSPE called for ventilation assessments and improvements /9
Nurses & Engineers: The tag-team professionals of boots-on-the-ground health & safety.

(plus occupational/industrial hygienists, the forgotten middle child)

Together we've got the public's back. /10

• • •

Missing some Tweet in this thread? You can try to force a refresh
 

Keep Current with David Elfstrom

David Elfstrom Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @DavidElfstrom

26 Jul
Ontario Professional Engineers working in building facilities management, especially but not limited to public buildings with known poor ventilation such as schools: ASHRAE unequivocally states #COVIDisAirborne. There is a Duty to Report involving safety. /1 ImageImage
When the reckoning comes regarding failure to prevent #airborne transmission of SARS-CoV-2, Professional Engineers should be on the right side of history. Continue to follow the Professional Practice Guideline.
@PEO_HQ @O_S_P_E /2
Engineers need to go on record with their employer when they have identified a safety concern. They may have limited options to affect change, but they do have a duty to report it up the chain of responsibility. Write that memo. Come away with a clear conscious. /3
Read 5 tweets
13 Jun
1/ Oh hai Clinical Excellence Commission @NSWCEC. Looks like you wrote an IPAC Manual for Quarantine Hotels recommending air pressure differential limits without considering the implications. Would you like some assistance with that? THREAD... Clippy from Microsoft Office 97Image of web page showing IPAC Manual for Quarantine Hotels
2/ Allow me to introduce you to Bernoulli's Equation as it pertains to flow through an orifice. In this case, under and around a door. Air flow through a sharp-edged circular orifice. Q = Cd * Af
3/ Bernoulli's equation allows us to predict airflow from a pressure difference, and vice-versa. The Florida Energy Center tested various orifices for flow & pressure difference. ba-pirc.org/casestud/retur… Using these results I calculate a Cd of 0.71 for various slots. Table from Florida Energy Center study on return air paths s
Read 21 tweets
25 May
1/ Dental office #COVIDCO2. The perfectly operable window is closed. 🤦‍♂️ THREAD... Handheld CO2 monitor (ARANET4) in front of a window, with th
2/ At the end of my visit, in a 144 sqft room with 9' ceilings, the hygienist and myself, it reached 1500 ppm. Overall rebreathed fraction of air from others reached 2.8%. The door to the operatory was open 1 inch. Chart of CO2 readings, showing initial value of 1325 ppm and
3/ I believe this is the outdoor air intake for the whole building. Located behind two air conditioner outdoor units. Rusty grille approximately 12 inches x 12 inches on the side
Read 10 tweets
21 May
1/ The Delta Fredericton has central corridor air pressurization and shared washroom exhaust. Lower floors may have inadequate pressure allowing air to flow out of suites. Failure of an exhaust fan can lead to direct connection between all suites on same shaft, @ShiftNB
2/ This style of ventilation & exhaust is disproportionally prevalent in Ontario apartment building outbreaks. Before concluding fomite transmission a more detailed analysis by subject matter experts (building science) is required. @DFisman @IPACCanada docs.google.com/spreadsheets/d…
3/ More detail about the possible mechanisms from building science in this thread:
Read 8 tweets
10 May
1/ Public Health @cityofhamilton, to stamp this out fast, you should issue an order requiring off-site air-gapped isolation/quarantine accommodation for those with an active infection. cbc.ca/news/canada/ha…
2/ Off-site air-gapped isolation can take the form of individual trailers, or a newer hotel that has been tested for dwelling unit compartmentalization.
3/ We know from decades of building science that there is significant unintentional air transfer between suites, especially in older buildings.
Read 7 tweets
4 May
#Onted, who would be able to provide data on number of classrooms, students per classroom etc for Ontario so that I can do some capital cost and operational costs on air quality related upgrades? More than the 2015 facility condition list. edu.gov.on.ca/eng/parents/fc…
2/ I'm thinking of some per-classroom budget numbers balancing operable windows/fan, HRV, filtration, upper room UVGI, including energy costs/penalty, GHG emissions, maintenance.
3/ I can do analysis per classroom with an "average" class size or some distribution bins and then multiply through by total classrooms to arrive at a total $ figure.
Read 4 tweets

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Too expensive? Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal Become our Patreon

Thank you for your support!

Follow Us on Twitter!

:(