There are three basic types I can think of.
Media: metal mesh, fiberglass or paper. The come in many flavors, from
just enough to stop the really big stuff to very effective.
Electronic: Uses charged grids to capture mid to small dust and stuff.
Very good in some situations.
Electrostatic. I variation of the above that does not use a power
supply. Less effective, but also can be useful.
UV - not really a filter it uses UV light to kill many kinds of microbes
in the air. Good if you have that kind of problem, but it looses efficiency
in time and many people don't service it often enough.
It might be better to describe your situation and what your concerns are
and why you think you need some sort of air cleaner, so we might be able to
better guide you.
They're home implementations of a "Cottrell Precipitator". They act
by putting up a high voltage field that attracts dust to a charge plate.
In industrial use, they collect between 90% and 98% of particles in
Home versions work the same way; you take out the collecting unit and
wash it in a big plastic tub to remove the collected dust and dirt. This
only works in forced air heating systems. I had one in my old home, my
new house uses hot water heat.
Yes., and Yes.
BUT, if you install one, you need to insure that the ductwork can handle the
added resistance of one of the AirBear or like media scrubbers.
Now...UV-C band lights are not filters. They filter nothing.
They are, when talking about the better brands, air disinfectants. The
properly sized unit will have a 80%+ first pass kill rate, and yes...they
are worth every penny IMO...and I have two installed in my system...(cant
sell what you dont believe in, and I believe in them fully.
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