DIY Positive Pressure Suit
civilpedia.org
civilpedia.org
- Source of clean air: HEPA filter will get contaminated and needs to be changed. UV sterilization might do it, but bulky and power intensive. Otherwise carry your own gases -- extremely technical, likely to asphyxiate yourself.
- As soon as you go I to a red zone the exterior of the suit is contaminated. Basically you need a disposable suit/gown outside the positive pressure suit.
Only other issue is that this is bonkers. Stay at home, wash your hands, wear a face shield when out to prevent touching your face if need be.
A few layers of cotton is usually enough to filter 95%> of all 0.3 micron particles this is because the filtration is based on the fact that the thickness of the filter is orders of magnitude larger than the size of the particles so the size individual holes at any given layer don’t matter that much.
That said the majority of the benefit from this suit wouldn’t come from air filtering but from the fact that you won’t get contaminated droplets on your face and you won’t be able to touch your face with your hands after touching contaminated surfaces.
The median-fit factor of the homemade masks was one-half that of the surgical masks. Both masks significantly reduced the number of microorganisms expelled by volunteers, although the surgical mask was 3 times more effective in blocking transmission than the homemade mask.
The idea is that you can keep throwing out the outer suit but keep the rest.
When I got to work, I was swimming in my own sweat. I remember taking it off and draining buckets of sweat out of the 'sock parts'.
If this thing is air tight, I expect it would work about the same. That little blower wont be enough to cool you down on a warm day and you will be enjoying a sweat bath.
Of course, it means there will be more to worry about contaminating when doffing.
If you need to go outside and you’ll be in occasional contact with other people gloves and a face shield will do.
If you’ll be in constant contact with other people or in situations where air circulation will be limited e.g. public transport or small offices then a respirator / face conforming mask needs to be added.
Maybe you could make one out of a snorkel mask (like one of the dodgy full-face ones: https://smile.amazon.com/dp/B07BP6CTBQ/) and a vacuum cleaner?
Random picture from Google: https://www.google.com/imgres?imgurl=http%3A%2F%2Fwww.txbiom...
https://civilpedia.org/p/?pid=101&t=p&h=Basics+of+IEC+Fusion
or this
https://civilpedia.org/p/?pid=30&t=p&h=Laser+Microscope
I've never seen that before...
A HEPA filter has a stricter rating than the N95 masks that healthcare workers use.
"HEPA, which stands for High Efficiency Particulate Air, is a designation used to describe filters that are able to trap 99.97 percent of particles that are 0.3 microns"
N95: Removes 95% of all particles that are at least 0.3 microns in diameter
There's what it says it does, and the probability that it actually does what it says it does. Those are two different considerations.
E.g. I've seen some vacuum cleaners which have HEPA filters reviewed as a bit useless at filtering because the particles flow through small gaps around the filter.
Try it: Turn off the motor, and take shallow breaths, see how much air you get.
Source: have used one for welding.
Now, how much if I wanted to buy one? :)
The idea was to use parts that are still available easily, although I worry about the scuba masks for it.
Our other builds are at https://robots-everywhere.com/re_wiki/pub/web/Cookbook.SaltM...
If I was to change anything, I'd have more air go between the two layers, for comfort. Or use a less noisy air source than an air bed blower.
Why? Because hazmat suits are for, well, hazardous situations. Hazmat suits invoke thoughts of radiation, of deadly gas, of immense pain and long term disability. In short: they're scary, and wearing one could scare people. Thus, I figured they might already be banned in some areas.
https://smile.amazon.com/Rubies-Adult-Jurassic-Inflatable-Co...