What is your username on X? I am not using it anymore so have a long list of unread DM's.

Thank you for sharing (and registering too)!

If the timezone makes it difficult to attend live, do register so we can let you know as soon as the recording is up.

Doh...forgot to attach my picture!

We are limited by budget, so these units will add about 1.5-2.5 eACH to the space, or effectively mitigate about 7 kids worth per classroom. It isn't perfect and with double the budget I think we could hit close to ASHREA 241 levels with current HVAC system.

Have not tested them, but in general in 2025 if it's not tested against a respirator standard (N95, FFP2, KN95) then likely device can't meet those performance specs. Their website doesn't list any mask standards it complies to but claims a general "95%" which to me is a red flag.

As I understand it yes, of course all the data is animal models but most experiments outcomes are not infection but death. Lower dose reduces probability of death in animals.
qmrawiki.org/experiments/...

So lower dose, in my opinion is always better. But we also need built enviro to have Ro < 1 too

Ahh...yes but this is where it gets interesting. At low risk levels it becomes basically linear(meaning half dose results in half risk). However if the curve is not exponential reducing dose by half could be actually 1/4 risk. Which means are targeted vent+filter targets are easier to meet.

[3/3] Charles Haas has had some good publications on this in the water-borne front. Anyways didn't catch this in the video, and thought it might relevent, and thanks for making the videos!
academic.oup.com/aje/article-...

[2/3] ...it's impossible to breathe in less than 1 virus, it's either 0 or 1. We also have very little data at low dose exposure as to what curve we should use, because it requires tons of data to resolve a 10% chance of infection. So care must be used when trying to estimate below a 1% risk IMO.

[1/3]I think it's also important to note the Wells-Riley model uses a exponential dose-response model(hence 1-exp()). Using it for very-low exposure begins to separate from the physical result. Such that breathing in dose that low enough to represent 0.1 viruses still has prob infection but...

They have legit KF94's and were one of the first companies to import a wide range of KF94's into the US during the beginning of the pandemic.