The bacterial horror of hot-air hand dryers (2018)
health.harvard.edu
health.harvard.edu
Maybe you should from time to time. Your immunity cannot be trained without real world bacteria and viruses. And kindergartens are real viruses and bacteria incubators.
I thought COVID busted the whole “wash your hands to avoid the flu” thing for viral respiratory diseases.
I thought most of them (influenza, parainfluenza, RSV and all the other coronaviruses) were enveloped viruses like covid-19.
I guess adenoviruses would be the exception.
alcohol can not kill everything.
Also it’s what contributes to norovirus being primarily a GI virus (it gets past extreme pH of the stomach).
> In addition, air from real-world bathrooms may contain fewer bacteria than the bathrooms in the study. The sampled restrooms were located in a university health sciences building, and at least some of the bacteria came from experiments going on in laboratories within the building.
But this was unknown.
For years manufacturers only knew about and produced “Form 1” without issue for years until “Form 2” showed up out of nowhere. Maybe from a lab studying it, who knows.
But once it’s out, as it’s more stable, it’s preferred! It “infected” a key manufacturing plant with it, and the batches kept showing up in that form. And cleaning it away is virtually impossible.
> And Form Two went everywhere. Within days of identifying Form Two, the company’s analytical lab could only make that form of the drug. The bulk drug coming off the production line in Chicago turned out to be contaminated before it ever went in to the capsules. Staff from Chicago were sent to an uncontaminated production line in Italy to find out if they were doing anything differently. Within weeks, that line was producing Form Two as well.
As it’s more stable, it means it doesn’t dissolve as well, but is also favoured.
That’s bad news if you want a pill that dissolves in your stomach (or in this case, in the liquid capsules), or need an injectable solution.
https://www.chemistryworld.com/podcasts/ritonavir/4011593.ar...
The (fear-mongering chaser?):
> This wasn’t the first drug to show unexpected polymorphism. And it certainly wouldn’t be the last. Research published in 2018 suggests that a more stable polymorph is waiting to be created for about fifteen to fifty percent of all drugs.
here are the technical details: https://cmbe.engr.uga.edu/bche4520/Other/Ch9/Bauer%202001.pd...
I'm no biologist, but surely as with (most?) bacteria that depends on whether your immune system is regularly exposed to it or not, right?
Cursory search tells me:
> Staphylococcus aureus [...] is a usual member of the microbiota of the body, frequently found in the upper respiratory tract and on the skin. [...] Although S. aureus usually acts as a commensal of the human microbiota, it can also become an opportunistic pathogen, being a common cause of skin infections including abscesses --- https://en.wikipedia.org/wiki/Staphylococcus_aureus
> An opportunistic infection is an infection caused by pathogens [...] that take advantage of an opportunity not normally available. These opportunities can stem from a variety of sources, such as a weakened immune system --- https://en.wikipedia.org/wiki/Opportunistic_infection
Wonder how it's an exception.
https://en.wikipedia.org/wiki/Methicillin-resistant_Staphylo...
These are beyond "a tad annoying" and into "hearing damage".
https://academic.oup.com/pch/article-abstract/25/4/216/55195...
I just measured 120 dBA blowing into the mic next to my sleeping girlfriend without her waking up.
Not to question the results, but methodology is important.
Snapping?
Or is this a new fad I don't know about?
However, despite some people trying to call me "autistic" as a term of abuse (including a line manager!), my actual score on an (online) autism spectrum test was solidly in the "mundane and normal" category.
But as a sound engineer I am aware that A) there is such a thing as too loud and B) people are very subjective in what they perceive as unpleasent sounds and when it is unpleasant to them they are more sensitive to it
I have tinnitus and so my sensitivity might be lower than the average person. Other sounds that cause me pain and distress:
1. Movie theaters these days. Why are they so goddamn loud? I can't tell if it's the sound design of the movie, or if the volume is way up in the theater. If I don't wear earplugs, my ears will be in pain and ringing for days.
2. My refrigerator that has developed an obnoxious electric whine. I can hear it from across the house. It is currently being replaced, and I am spending an absurd amount of money on a quiet refrigerator.
3. A commercial carpet cleaning vacuum running for hours at a time down the block. Again with the high-pitched sound and I can hear it from a mile away. And it's always in the mornings when I am trying to read.
4. Ceramic dishware clashing together. This too causes pain. When I do the dishes, I am mindful of the loud sounds made when stacking plates and bowls, so I stack carefully. When family does the dishes, they create a soundscape from hell. It is like their hands are not connected to their brains and they've never put anything down gently in their entire lives.
5. Industrial electrical boxes. I parked on a top floor of a local parking garage the other day, and I noticed 4-6 very large electrical boxes mounted along one of the walls. The sound coming from these boxes was so loud, so sharp to my ears, I had to get back in the car right away and drive out. It only took a few moments of exposure and my ears were ringing and my head was splitting for hours.
I know I must seem insane, but I don't care. I will go out of my way to create quiet spaces, to preserve the silence, to avoid noise that causes distress, because sometimes it takes days for me to recover. And having to battle this stuff constantly just makes me angry and annoyed, and I don't like that.
I've had numerous ear and hearing exams and in addition to the tinnitus, I'm told I have severe "hyperacusis."
As for cinemas: Unless you go to weird off the beat venues the listening levels should be those specified by the mixing engineer in the studio. Most cinemas have dolby certifications, which means the engineer in the studio will hear nearly exactly what you hear.
The levels within cinema productions are painstakingly kept below any levels considered harmful by both the industry and the law for obvious reasons. That however doesn't mean it will be equally pleasant to all people or that there are some people with special hearing conditions where it might come across as downright hostile (like you).
If this happens often to you I'd suggest investing into decent hearing protection. I have one with me at all times, despite being relatively insensitive to sounds and levels that would put other people at the edge of their seats.
I find air drivers uncomfortably loud. My children are terrified of them and I cannot blame them. It's the volume but also the nature of the sound that are both rather awful.
Don't get me wrong here, I wouldn't want to spend my day next to one of those things. But it isn't as loud as "I am afraid for my hearing"-loud.
If there are so many bacteria already milling about in the air, you'd have already breathed in billions (?) of them before you got to the dryer.
If you are not immunocompromised, you do yourself a disservice by being so worried about bacteria. I don't bother with attempting to avoid or prevent that might merely inconvenience you for a while but is eminently treatable at home (flu, for example).
The article mentions attaching HEPA filters to hand dryers, but that sounds like a terrible idea since bathrooms are often humid. A wet filter quickly becomes a breeding ground for mold.
If you really want to turn your hand dryer into an air sanitizer, how about ensuring that at some point during the air's passage through the machine, it reaches a temperature high enough to kill germs? (Cool it down a bit before it reaches the exhaust, of course.) Or maybe install a UVC lamp inside? These tricks will require a larger and much more expensive machine, though.
I always wash my hands, because societal norms strongly discourage any alternative. But I have no illusions about the fact that I'm picking up more bacteria half the time. If there are no paper towels to dry, I'll almost always just shake the water off and dry my hands on my pants instead. Beyond the bacteria-blasting, I find that hot air dryers take way too long and still leave my hands damp anyway.
And if you touch the door handle on your way out, you've thoroughly undone any cleaning you may have just performed.
Thankfully I'm not a germophobe, so I follow societal norms and wash lest I'm called out on it, and don't actively think about any of this.
Bathrooms, particularly public ones, are wet, mouldering places with insufficient ventilation. And we go into them every day to get ourselves clean. Taking air out of the bathroom and injecting it somewhere else is about the best way I can think of to fix that, and we only run them intermittently.
https://www.aprilaire.com/whole-house-products/ventilation/m...
Does nobody hear know what an air/heat exchanger does? They’re for ventilating modern sealed construction so you don’t choke to death on fumes from your belongings, or get cancer from your wood shop.
So, same idea as bathroom fan but really big and running it less intermittently. He wants a big industrial air-changer so his bathroom is less dank.
One problem is this will definitely suck a lot of heat out of the house. You might want to only run it when a sensor detects humidity, and just give it a ton of hysterisis/etc so that it runs a relatively long time. Pulling a bunch of heat out of your house 24/7 will be expensive and will cause other problems (like extreme low humidity since the furnace is running much more, which will lead to crazy amounts of static etc). You can of course run a humidifier (or whole-house humidifier) etc but it's generally not without problems to just dump air 24/7.
(I had similar sentiments around my current house not having good air handling for the stove, if you are frying something it can get pretty greasy/nasty inside even with the fan on, and you can't always open a window depending on the weather.)
On the other hand, this also might help with CO2/oxygen levels, which might lead to better overall health/comfort too, because your air is being cycled more aggressively. The overall thrust that houses are getting too airtight nowadays is generally correct, and this has negative health effects too. It is, again, unfortunately balanced against heating costs (energy efficiency seals the house up, then we circulate the air out...) and other problems. If the house is super breezy (or has air changers aggressively changing the air) then you're also pumping out all your heat and humidity.
If you are going to have some strong air changers though, you could run a heat pump in the air changer stage too. Being able to spend 1 unit of energy to move 10 units of heat from the exhaust back to the intake would be ideal, and the air is going outside anyway so you might as well dump waste cold (or waste heat, in the summer) outside while you're doing it.
An easier step, if you have the space in your bathroom, would just be to run a dehumidifier in the bathroom. Obviously would be pointless/inefficient during a shower, but maybe you could have a switch where one pole is "bathroom fan on" and the other one is "dehumidifier on". Or get a timer switch and just run it for an hour after the shower is done.
It is also worth noting that if you get the humidity under control in general, that the house itself will act as an "anchor" and tend to resist changes from the mean. The bathroom is dank because all the building materials around it are saturated and constantly giving off water, if you can keep it at 40-50% humidity more regularly then eventually they will dry out and the system stabilizes at a less-dank humidity.
https://www.aprilaire.com/whole-house-products/ventilation/m...
At the time dust collection systems were still pretty exotic, so they were putting them into wood shops to make sure the dust didn’t get sucked into the rest of the house.
> If you're a homeowner, be sure that your fan is properly vented directly to the home's exterior via an insulated duct. "It was common in the '70s and '80s for it to be vented into the attic space," says Bayne. "Building codes today require that the exhaust is vented outside through insulated ducting to a roof vent that goes directly to the exterior." Otherwise, you may be contributing to moisture and mold problems in your attic or wall spaces.
https://home.howstuffworks.com/bathroom-exhaust-fan.htm
Related, but I like how kitchen exhausts sometimes come out of a vent on the side of the house, so if you go out into the backyard you can walk by and smell bacon frying or whatever. (OTOH I once lived in a condo with an under-the-microwave exhaust that didn't actually vent outside, it just spat everything up onto the kitchen ceiling... a wet greasy spot accumulated up there before I realized what was going on.)
Isn't the primary purpose of a kitchen vent to remove smoke from the kitchen?
How on earth is moving smoke from one part of the kitchen to another part of the kitchen supposed to improve anything? Is your smoke alarm that location-sensitive? (What if there was a fire 20 feet away from the smoke alarm?) Will it be any easier to breathe?
You can get grease filters now with charcoal filters embedded within, and that might help a little bit with smoke.