I thought it would be interesting to take a look at a small home air filter unit with a fairly big pleated filter.
It uses quite a small fan, so it creates enough noise to be annoying if used in a bedroom, unless you wanted background noise. (It helps some people sleep). The fan speed control method is unusual.
A search showed that the replacement filter costs as much as the full unit supplied with one! I wonder if that's just due to the wide range of prices online, or if it's just to hook customers into an ongoing expense.
When I was looking on eBay I noticed that people were selling used units with old filters. Aside from getting a used filter from an unknown environment, you don't know how long the filter has been in use. Others were being sold with no filter, probably because they couldn't get a new one or it cost more than a new unit.
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It uses quite a small fan, so it creates enough noise to be annoying if used in a bedroom, unless you wanted background noise. (It helps some people sleep). The fan speed control method is unusual.
A search showed that the replacement filter costs as much as the full unit supplied with one! I wonder if that's just due to the wide range of prices online, or if it's just to hook customers into an ongoing expense.
When I was looking on eBay I noticed that people were selling used units with old filters. Aside from getting a used filter from an unknown environment, you don't know how long the filter has been in use. Others were being sold with no filter, probably because they couldn't get a new one or it cost more than a new unit.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
Typical Chinese JUNK/money making scam!👹
Not a bad thing if you remove the electronics, and maybe put a better fan in it. I'm thinking about making my own 3D printed air cleaner with a 120mm fan, but I'm also thinking how can I fold the paper in it so I get a greater surface area and air flow. Maybe with some gears. I don't know yet.
Overall these small units don't have the power to move and mix air in a normal size room. A ceiling fan might help to mix air and help the little air cleaners.
I took two high speed 12v computer CPU cooling fans n put in rectangle wood box with two sides open added a uv light rear of which i used a commercial ac filter washable air filter । Just it keeps on going ever since wash filter after a weak । I opted for 2amp 12v power spully to power
Shouldn't the ionizer have touched the metal plate???
Lovin' the in pic title "Cheap Unit"
Computer fans are brilliant.
1, They're quiet.
2, They run for years.
3, They have a standard mounting.
4, They're available all over.
I use them as extraction fans 😀
My mates use in line filters available as kits (in line fan, massive carbon filter, duct tape, and big jubilee clips) – all available from £35 from Amazon , which are very noisy but last about 18 month+. I notice that most of my friends dispense with ducting and mount the fans direct to filter and pointing the whole lot out of the grow tent as it's quieter. So with the bedroom fan ( I made one yesterday drunk – its great) it suggests mounting the filter (filter paper) as close to the fan as possible. Maybe using filters at both ends? Or using a hoover HEPA? If I could make a small filter like this for my pals they could use it in a grow tent and run the in line fans as extracters of heat and humidity when needed instead of all the time.
I have had a air filter fan for several years. Just vaccum out the filter every few months and it will last for YEARS.
Just a heads up. China makes and sells really good air purifiers for their domestic market. They are constantly battling smog and chemical fumes in their big cities. So their home or commercial air purifiers are really big, like man-size. They are used in lobbies and restaurants etc. They are packed with all the latest technology and are not cheap.
Am I going mad, because BC would know if anyone does that UV LEDs are commonly available. Or aren't they suitable for sterilisation?
One could just use it as a fan after disabling the ionizer, once filter expires.
In regard to the 510 vs 1000 ohm resistors, I tink it has to do with the load each transistor has to switch. When a typical transistor has higher collector emitter voltage (beacuse of lower impedance load driven from the same power rail), it needs less base current to saturate. hence the higer base resistor on the higher load transistor. Anyway I gess in this case the effect is probably negligible
Very good remark of bad design coupling beetweeen ionizers and isolated power supply
So if a negatively charged ion generator makes dust collect on surfaces, wouldn't you want a positively charged ion generator so the dust stays airborne so it can be filtered?