81–90 of 110 posts
Slightly off topic; I've been reading about putting dispersal disinfectants like Tea Tree Oil [1] into ventilation shafts so they spread around the building. Works similar to O3, but is safe around people. I'm wondering what sort of concentrations these dispersals need to be to actually make a difference. [1] https://www.pathology.uwa.edu.au/research/microbiology/tea-t...
Earlier quoted context omitted.
The question with that system is: where is the replacement air coming from? To be effective for disease particle controls, it needs to come from outside, otherwise you'd just be sucking dirty air from the rest of the building into the classroom - or even worse: backdrafting CO2 and CO from any combustion appliances within the building envelope. You can achieve a clean air supply by opening another window in the class…
Is there a reason you can’t just recirculate through a HEPA filter? They capture viruses AFAIK. Seems easier than recovering exhaust heat and refilling from outside.
This device cleans up a medium size room from forest-fire smoke in 15 minutes and scrubs it squeaky-clean in a few hours (as measured with a laser particulate counter).
Earlier quoted context omitted.
At least with heat recovery ventilators, the air streams do not mix at all. Unless the virus finds a way to penetrate the metal fins of the heat exchanger, it should be completely fine.
There are several different designs, some there is a mix of streams. Most are sadly not particularly efficient overall, but still much better than leaving a window open.
1. https://www.greenbuildingadvisor.com/article/misconceptions-...
Can someone explain how a garden-varity HEPA filter duct-taped to a boxed fan is not a complete solution to airborne COVID droplet air filtration? This device cleans up a medium size room from forest-fire smoke in 15 minutes and scrubs it squeaky-clean in a few hours (as measured with a laser particulate counter).
Slightly off topic; I've been reading about putting dispersal disinfectants like Tea Tree Oil [1] into ventilation shafts so they spread around the building. Works similar to O3, but is safe around people. I'm wondering what sort of concentrations these dispersals need to be to actually make a difference. [1] https://www.pathology.uwa.edu.au/research/microbiology/tea-t...
Can someone explain how a garden-varity HEPA filter duct-taped to a boxed fan is not a complete solution to airborne COVID droplet air filtration? This device cleans up a medium size room from forest-fire smoke in 15 minutes and scrubs it squeaky-clean in a few hours (as measured with a laser particulate counter).
Box fans are not good for attaching filters too because they are not designed to deal with static pressure from a filter. The gaps between the blades and the case mean if you put much/any obstacle in the way, it will just recirculate unfiltered air.
This smells of magic unicorn shit to me.
Anything but. They’ve got validated 3rd party studies. Plus they’re a real Hardware product company with a long history of quality product. Not some Silicon Valley “ai magic virus eater”.
The FDA was created to fight bogus miracle cures and tainted food.
> they’re a real Hardware product company with a long history of quality product. Not some Silicon Valley “ai magic virus eater”.
shrug then they shouldn't mind filing a 510k [1].
[1] https://www.fda.gov/medical-devices/device-approvals-denials...