[DIYbio] DIY air sterilizer using electricity

Hi! It's my first publication here. English isn't my native language, so forgive my mistakes...
HEPA filters in my country are very expensive, and the squirrel cage blower used to pump them cost thousands of $ (equivalently).
So I made a few searches, and I found this:

https://www.youtube.com/watch?v=x5YFK8mmeRQ
http://www.instructables.com/id/How-to-Make-a-Negative-Ion-air-ionizer/
http://www.engineeringtoolbox.com/particle-sizes-d_934.html

Anyone has thoughts on this?  I was thinking doing several aluminum foil covered rectangular plates, spaced 1.5 cm (need to make some calculations on this, to not make a accidental discharge). They are positively/negatively alternated (I think this will have a better performance). That capacitors bank can handle something this big? I was making a cardboard prototype, but luckily, I read somewhere that both cardboard and wood are good conductor of high voltage.

Any help will be appreciated! Good day!

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