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

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>>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.
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