What do you think about air washers? In addition to air filters, they blow air over wet surfaces to both clean and humidify the air.
Here is one from Phillips: https://www.youtube.com/watch?v=n3xC3qxVphw
A small DIY air purifier
41–50 of 178 posts
Re: A small DIY air purifier
#42Do air purifiers really work? I always have impression they're just sham, or at least placebo.
A few years back I had to temporarily move back to my parents while getting a new place. It had been years since I'd used my room, and it had been neglected a bit.
First days I started coughing a lot when staying the room for a bit, and I woke up quite stuffy in the morning. Got me an air purifier with HEPA filter and let it run at max setting while at work. After running it a few days like this, I didn't have any more issues.
Re: A small DIY air purifier
#43Speaking of air purifiers, does anyone have recommendations for one that is quiet and still effective? I have a pair of Electrolux EAP300s, in small rooms. Unfortunately on the lowest manual setting ("Quiet") they hardly do anything for air quality. And they're still louder than I like. I think they really optimized for cost; these devices feel very light and plasticy, the fan sounds cheap and has an uneven tone to i…
It depends on what noise level is acceptable for you and the room size. Out of 30 or so air purifiers available in shops here, of all the ones that are in the $100-500 category, the Winix P/U450 are able to push the largest amount of air under the constraint of HEPA filters are rated at which air speed they are most effective and how much pressure is needed. The ammount of pressure will only rise as the filter is sat…
I think EAP300 is rated 26dbA on its lowest level.
I don't mind expensive, I'm tired of buying poor quality products.
Re: A small DIY air purifier
#44I would say that there are electronic schemes and plans to build DIY ion air cleaners. They works nice to remove dust or tabacoo from air. Also, ozone air purifier make wonders to keep at bay smells and fats (wonderful to have on the kitchen), and kills bacterias, spores and fungus.
Ozone is harmful.
O3 isn't harmful in small quantity : https://en.wikipedia.org/wiki/Ozone#Consumers
Also, ozone purifiers not need to keep working all the time. A usual usage it's have a burst of ozone to sanitize a place, and wait a few minutes to decompose to O2. The result is that any smell is removed, and the ambient is sanitized. I saw this a lot on hotels where they use "ozone cannons" where they are cleaning rooms.
Re: A small DIY air purifier
#45How about a 'filter' that can 'wash' the air with clean water. To me it appears to me the best possible solution to clean air in a confined space. To put it simply, air can be bubbled through the clean water, to scrub it of both particulate and chemical contaminants. No doubt the apparatus will lend itself to several technical challenges like noise and the need for periodic changes of the water.
I believe such air purifiers already exist.
Re: A small DIY air purifier
#46Earlier quoted context omitted.
> Because they are designed to be quiet and still provide good flow of air they produce almost no pressure differential to speak of and the flow can be halved by a wire mesh that is a bit too dense There are high static pressure fans which address this problem, specifically designed to work with pressure differential, usually used to blow air through radiators for water cooling. The fan linked in the github page (Noc…
> it provides a static pressure of 7.63 mmH2O, which is very high. Actually, it depends on the specific HEPA filter if that is enough or not. If it's not enough, the air will find the path of less resistance and circulate in and out thru the fan blades, but not thru the filter. For some HEPA filters you can find specs. These ( https://www.airclean.co.uk/download/4724 ) are spec to 250 Pa which would be about 25 mm H2…
Even if they don't recirculate, I sort of doubt that these small fans are going to achieve sufficient air flow through the filter (a radiator is much less of an obstruction than a HEPA filter).
Re: A small DIY air purifier
#47Earlier quoted context omitted.
> Because they are designed to be quiet and still provide good flow of air they produce almost no pressure differential to speak of and the flow can be halved by a wire mesh that is a bit too dense There are high static pressure fans which address this problem, specifically designed to work with pressure differential, usually used to blow air through radiators for water cooling. The fan linked in the github page (Noc…
https://noctua.at/en/nf-f12-pwm/specification Static pressure 2,61 mm H₂O <-- according to the vendor
I got it from here:
https://noctua.at/en/nf-f12-industrialppc-3000-pwm/specifica...
Or if you just follow the link on the linked page:
Re: A small DIY air purifier
#48Pretty cool project.... Except for the fact that I cannot buy any of the parts from pccasegear. They deny certain geographical areas access to their website. In fact, this seems to be the new normal. Last week, I was denied access to a recipe from a .au website. Flipping on my VPN restores access..
Re: A small DIY air purifier
#49How about a 'filter' that can 'wash' the air with clean water. To me it appears to me the best possible solution to clean air in a confined space. To put it simply, air can be bubbled through the clean water, to scrub it of both particulate and chemical contaminants. No doubt the apparatus will lend itself to several technical challenges like noise and the need for periodic changes of the water. I believe such air pu…
They do. They're literally called "air washers," and you can buy them on Amazon.
Re: A small DIY air purifier
#50This is a really cool project but frankly you can do it a lot cheaper. Find the cheapest box fan you can find, and find the cheapest HEPA filter you can, and strap the HEPA filter to the front. To improve air purification even futher, slap an activated carbon filter on the front too, and your air purifier now filters VoCs! For cheap Activated Carbon Filters, look into the kind used for Aquarium filters. They'll work…
This may or may not work, cheap box fans aren't designed to push/pull air through obstructions (ie: low static pressure) and HEPA filters are giant obstructions. So instead of the air going through the filter it'll go through gaps, around the edges of the blades, etc.
I used a cheap box fan for some DIY ventilation and the loss in airflow is massive after filter and ducting.