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.
4/ Also, failure of a centralized exhaust fan can provide a direct linkage between suites.
5/ Please engage with engineers & building scientists to assess buildings in outbreak and to advise on temporary #ventilation and #filtration controls.
7/ Here is why exhaust function is critical for older buildings during the pandemic: If one is off, there is a DIRECT connection to all other suites sharing the same shaft, driven by the other exhaust. Air will follow the path of least resistance. Grilles are often clogged. Illustration showing air pathway when an exhaust fan is not Photograph of a clogged exhaust grille from an apartment bui

• • •

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

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
4 May
1/ HOW TO HIDE YOUR DATA
In the highlighted section from Conly's presentation last month he references no transmission events in 5544 person-hours.
Source is "Conly J et al ARIC". Here's the section of that reference: (aricjournal.biomedcentral.com/articles/10.11…) H/T @jmcrookston @CPita3 There have been an estimated 5544 person hours of continuous
2/ Okay, so reference 26 is the Alberta Health Services Rapid Review. link: albertahealthservices.ca/assets/info/pp…
3/ And here is the 5544 person hours passage from the Alberta Rapid Review. What is the source? HIMSELF, personal communication.

This intellectual dishonesty has been used to support the denial of respiratory protection to front-line health care workers.
Read 5 tweets
3 May
WHO's pandemic guidance language for health care workers regarding proper PPE is belittling and paternalistic on matters of workplace safety.

This language is like when construction workers chastise peers for wearing PPE because they think it's a sign of weakness. In general, health workers ...
Reminder once again of the fallacy of the "AGP" (aerosol generating procedure). Regular activities produce FAR MORE bioaerosols than specific medical procedures.
Same document, just above. Back to harms from acne again. This whole paragraph has Conly's fingerprints all over it. The WHO COVID-19 IPC GDG co...
Read 5 tweets
1 May
1/ I wear an N95 at locations outside of my home. I wear it to the grocery store, pharmacy and my doctor's office.

It's comfortable, doesn't hurt my ears, doesn't fog up my glasses, and easy to breathe through. I can wear it all day, anywhere. EXCEPT at the hospital! Photo of @DavidElfstrom wearing an N95 respirator and presen
2/ Many health care facilities require visitors to REMOVE their superior respiratory PPE and don a basic surgical ASTM Level 1 mask.

This practice must stop. Understanding the difference between surgical masks and N95
3/ Here's my friend Annamaria's experience this past Thursday when she went to @NGHSimcoe for her second vaccination, shared with her permission👇 When I got there, I stood in full view of the door and took
Read 14 tweets
29 Apr
U of T is making all classrooms achieve 6 ACH with #ventilation and #filtration, the same as for health care patient exam rooms. They measured air flow.
THIS should be the target for all Ontario daycare, elementary, and secondary schools too.
utoronto.ca/news/u-t-asses…
Children will be the last to be vaccinated. Schools & daycares will benefit immensely from reduced cold, flu, seasonal allergies by upgrading to 6 ACH. The time to start was a year ago. The next best time is tomorrow.
Big shout out to @ShellyMBoulder and the UC Boulder team that led the way on this last summer.
Read 4 tweets
28 Apr
This is bullshit policy @UHN. You won't permit a person to wear a clean N95 *respirator* (not mask) in your facility. You won't even allow someone to place your gappy surgical mask over top. Other health care facilities have no such problem. It's indefensible & unacceptable. /1 Image
Does a manufacturing facility say to a visitor "oh hey, take your safety shoes off and don our loafers".
Likewise, I've never been asked to remove my own provided hard hat in exchange for a bump cap or unprotected, as long as it meets sanitary requirements. /2
And you double down on it, even on April 22nd 2021. Can your Entrance Screening Working Group see their own logical fallacy?
If UHN wishes to maintain this policy, it should provide from a selection of pre-approved respirators. Charge a nominal fee if you must. /3 Image
Read 10 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!

:(