Build a do-it-yourself air purifier for about $25

By Adem Lewis / in , , , , , , , , , , , , , /

[ Music ]>>Airborne allergens can cause symptoms, and
you can reduce the amount of airborne allergens in your house by using filtration systems. There’s a whole array of filtration systems
that can be used, from furnace filters that go on the main furnace blower to
systems that you can use in a room. They range from $100 to $800
for the high-end systems. And today I’d like to show you the high-end
system, and then also show you a homemade system that should work fairly well at
home, for a fraction of the cost. This high-end system that’s been on loan to
us from Ann Arbor Vacuum is an $800 system that will filter virtually
every particle out of the air. This particle counter is measuring
particles that are .3 microns in size, and it samples every six seconds. With a system like this, you can filter
out the particles and therefore — and thereby reduce the allergy symptoms. So you can see we started off, I
believe it was about 400,000 particles. And with this counting system, we can
see that it goes down to essentially zero after a few seconds, after a few measurements. And now you can see we’re 400, and down to zero. This is an incredibly effective, high-efficiency
particulate air filter, or HEPA filter. And you can see that it’ll scrub the air
from about 400,000 particles per cubic foot down to zero particles per cubic foot. You’ve seen the high-end filter
system now and what it can do. It’s incredibly powerful. But not everyone can afford a
6- or 800-dollar HEPA system. So there is something that you can do to
filter your air, in a bedroom, for instance. And this is something that you can put
together with pieces from your hardware store. And what I’ve got here is about a
12- to 15-dollar, 20-inch box fan; and a HEPA filter that you
can buy for a furnace. So, this is a 20 by 20-inch HEPA filter. And it’s important that you recognize that
it comes in different levels of filtration. So, a MERV 13 filter is a very highly-rated
filter that’ll get a lot of very small — those 0.3 micron — particles out of the air. So this can simply be done by putting
the filter in front of the box fan, so the air is blowing through the filter. And I’ll just tape this filter here. You can see there’s a direction for the
air flow marked on the side of the filter. You’ll see, if you look at yours carefully. And now I’ll take the same counter and count
the particles coming through the system. So, our ambient count, again, is about 400,000. And I’ll turn the fan on
and count the particles. And we’ll see how they drop. Typically, this MERV filter
will cause about a 90% reduction in those small .3-micron particles. It measures every six seconds. And you can see I’ve gone
down from 400,000 to 54,000. It’ll probably hover around that point. So this $30 — 25, $30 system is filtering
90% of the particles out of the air. You’ll probably want to put something like this
in a bedroom, for instance, where you sleep and spend a good part of your day, to
filter those particles out of the air. If you want, you can put them in
other areas of the house, as well. [ Music ]

100 thoughts on “Build a do-it-yourself air purifier for about $25

  1. As I’m watching this, trying to think of everything I can to help my severe indoor allergies, my cat jumps on me. Then I realize, who am I kidding. As long as I love cats I’m going to suffer.

  2. Go right ahead and buy a noisy box fan for 35 at Wally world and a 25 dollar filter. Just buy a godamm air purifier for 75 …still have to replace filter but it's used more economically..hence only 1 mill in views over a 7 yr period…lame.

  3. I ordered these 20 x 20 x 2 inch merv 13 filters and they seem to work better than the 20x20x1 that I was using.

    More surface area? Anyone care to comment on 1 inch vs 2 inch effectiveness?

  4. what kind of absolute fucking idiot came up with this idea? a box fan won't push air through the filter. more air comes out the wrong side of the fan than goes through the filter, causing all the dust to blow out. dumbass

  5. Considering geoengineering is ubiquitous, where do you buy electret fibrous filtration systems for nanosized particle removal?

  6. Okay, so what I'm gathering from the comments is that I should be putting the filter on the opposite side of the fan. So should I turn it on to the highest speed? And on average, how often should I replace the filter? (dust allergy sufferer)

  7. The filter goes on the back and I know because I have a million more encyclopedias on my Internet then this scientist with a lab coat has.

  8. BS! I tried this and it simply doesn't flow air with s pleated filter. The filter would have to allow lots of air through. Box fans can't do it.

  9. Thank you! Just watched this with one of my employees whose doctor recommended an air filter for her daughter. She's so relieved to find an affordable option to try.

  10. Listen to the professor in the lab coat who work actually knows what he's talking about over a bunch Youtube geniuses. It's better to put the filter in the FRONT of the fan because most fans have a cord running in the back that prevents the filter from laying flat, also the filter needed is pretty THICK, it is easier to blow air through it from the front than to suck air through it from the back and push it back out. Also, if you are using a used fan that is already dirty and don't feel like cleaning the blades, putting the filter on the back will still allow the dirt that 's already there to blow through unfiltered.

  11. I really need help.what's the name of the meter?I need some air meter.I have an air poison here, but I don't know how to measure it?

  12. In theory, this do-it-yourself air purifier can work. However, with modern air purifier design there are many additional feature that these machines can offer to help improve your air quality even further. One in particular is a HEPA filter combined with an Activated Carbon filter to trap dust, allergens, mold spores, gases, smoke and volatile organic compounds. Some air purifiers even include an Ultra Violet light to destroy bacteria and viruses as they pass through the filters.

    Additionally, some air purifiers come with indoor air quality readers and mobile apps so you can actually see how good or bad the air quality is inside a room in real-time.

    While this do-it-yourself air purifier is a good start for someone on a budget, it's not a good long-term solution for someone who is serious about improving the air quality inside their homes.

  13. wow, that's a great idea, but wouldn't you put the filter in the back of the fan so the fan sucks the air through the filter?

  14. Best way to do this is by putting filter on the back of the fan, or the intake. It filters the air properly and keeps your fan from getting dirt. And it isn't only $25 it's closer to $40. $20 for the fan and I buy a nice filter for $18. The cheapest filter I can find that is 20×20 is about $13.

  15. Great idea that is all a air cleaner is is a fan and a filter. The only problem I have is that you must keep it out in the open for it to breathe. I would like something that would cool things in on the filter side and then blow the air out the top of the unit.

  16. He must be a PHD because he put the filter on the wrong side!

  17. recommendations where to buy the filter? i'm seeing merv 13's for like $40+ on amazon. that's canadian dollars.
    edit – sorry that's a 6 pack. but the question stands. would you have a link on amazon as to which one to get?

  18. See few.videos on YouTube. Does the filter go on front or back of fan. Seen videos showing both ways. Which is best?

  19. The fan is 15 dollars, a 20×20 filter as good as the one in an air purifier is at least 15 for the main filter, and another 15 for the carbon filter, so we are at 45, and it should go in back of the fan so the fan can pull it up close. sandwiched between two fans even better with a wood box built around them. Now your at 70-100 dollars but you have a 3-400 dollar air purifier.

  20. I would have thought it would be more effective to draw, to attach the filter to the back… would keep the fan cleaner too….no? I stopped shopping for air cleaners when consumer report showed most do not perform as advertised and some were actually harmful, the only ones well rated were out of my $$ bracket… of course, consumer reports are kind of useless these days
    I have used tule to save cleaning the bathroom fan often, attached to the inside of the grill, it catches most of the lint…

  21. I'm guessing Mr professor there doesn't have a degree in common sense!
    Everybody knows 1 inch pleated gilters kill air flow and clog quickly.
    I would only use 20x20x5 inch MERV 13 filters on a 20 inch box fan.
    Air flow will be MUCH better and filters will last MUCH longer.
    But what do i know i'm just a high school grad with a whole lot of

  22. I tried this out. I took the suggestions from the comments and taped the filter to the back side of the fan instead of the front like in the video. I noticed however, that with this setup, the strongest suction comes on the front side of the fan in the corners. To test this out, I put a note card in front of the corners to see if it was being drawn in and sure enough it was, whereas on the back side, the notecard wasn't sticking as strongly. To try to counteract this, I taped off the front corners as well. That improved the suction a bit, but I'm still not very sure thats it's working so well. My allergies don't seem to be improving and I actually think it's stirring up more dust/pollen than without.

  23. I believe that the hepa filter has a merv rating thats much too high/ restrictive for the fan to actually get the air through, it could work for a small while but once that filter gets even the slightest bit dirty, the air will escape out the sides. I'm thinking a slightly stronger fan and lower merv rating will be more effective and last longer.

  24. Really a fan of their product. hope you can hear them out and give it a try! Fresh air for a reasonable price!

  25. What's the fucking point of holding the particle counter right up to the filter or suction part? Your're supposed to measure the particle count of the air in its vicinity.

  26. wouldn't you want the filter to be behind the fan so that less particles go through the fan thereby prolonging the fans life because it doesn't get dirty then????

  27. Thank you, I wish I could have known this before buying my air purifier. I did not spend that much but I sure could have saved at least $20.00, and now I can make a homemade one as well, thanks again!

  28. I cut tiny circles out of the filter and put them in my nostrils…this filter will last for years. I can easily get about a thousand tiny circles from it and it goes every where !!

  29. Hmmmm. I just payed $200 for one, and was thinking.. “Isn’t this just a fan with a filter on it?

  30. You got it backwards. You put it on the rear of the fan so it sucks air through the filters. The suction will also help hold the filter in place tightly. The type of fan blades on most household fans do not blow into a filter as well as they can suck air through a filter. So by placing the filter in the back of the fan, you will have increased air flow & efficiency. It will also keep dirt from getting into the fan.

  31. That 1 inch filter will be totally plugged up within 30 days.
    And at $20 each, it gets expensive fast.
    Simply buy 20x20x4 inch filters anf you can get much longer filter life for about the same price.

  32. Would it be better to just put the fan on the windows in the rooms, point the fan outward, and blow the dust out?

  33. Great idea! What if we put filter on the intake side (so less force is needed to attach filter) – thanks..

  34. Put a cheap merv 7 in front of your spendy filter it will filter the large dust particles out and stop them from clogging the good filter change them when you see them start to discover your merv 13 will last about 3 times longer merv 7's can be had at the big boxes for 3 or 4 bucks a merv 13 runs close to 20.

  35. Anyone here who is allergic to cats (the Fel d 1 protein) and had positive results using HEPA filters (either the cheap or expensive ones)?

  36. Hawaii has alot of car exhsust,smokers,Tire rubber particles,Dirt. Polution. Oklahoma has Dirt everwhere.

  37. Thank you so much for that cheap air purifier system I'm going to try it I bought a hundred and something dollars purify I'm not too happy with it and I'm one of the people that are struggling to spend 6 to 800 dollars for a better one

  38. Don't listen to this clown! First off, you don't use a low static Pressure 20" bladed fan like that Lasko. Those 20" fans move 1700-3000 CFM but will only move 150-250 CFM with that filter and will restrict even more as they build up particulate matter. The motor will just overheat and possibly catch on FIRE when massively restricted using a filter like that. Blade fan motors amps will climb when restricted. So basically you get an extremely low CFM filter that does almost nothing and is a fire hazard as the air flow is almost zilch and the motor can't air cool while at the same time drawing more amps then rated.

    Instead use a squirrel cage blower The blades move the air by centrifugal force, literally throwing the air out of the wheel at the periphery, creating a suction inside the wheel. When restricted instead of increasing the amps the amps actually drop (Protecting the motor) as the cage is in a partial vacuum and there is less air to be  centrifugally thrown. If don't believe me go look at all the "Hepa" Air Scrubbers used on construction sites. They all use squirrel cage blowers . If you want to do it yourself. I'm doing drywall, sanding, painting and new flooring in my house so I made a temporary setup that will last the 3 months for the work to be down. You might already own a blower fan like this and can build it for $5-25 I already had the box, Filter and Blower so this cost me about $1 in tape and wire ties. I also have a Carbon filter you can't see in it. This filters about 400-500CFM and uses 20×30 filters that have 2.5 the surface area of the 16×16 filters and the $600-$1000 500CFM units used on construction sites.

  39. U should put 2 filters instead one in the back and the front so u do less cleaning when cleaning is in progress in the near future.

  40. Double the efficacy by mounting a filter on both sides of the fan box. It will make the fan work harder, so it may wear out sooner, but these box fans are usually pretty long-lived anyway.

  41. Does it matter if you put the filter on the back of the fan, with the arrow on the filter in the direction of the airflow?

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