intake filter

i wanted to run a intake fan in my grow room to bring in fresh air in from out side, what should i use to make sure i don't bring in bugs? it will be on the out side of my house so cant look suspicious. last time i got spider mites and i want to try to avoid them from now on...lol.

ive been told pantyhose work but was looking for other ideas?

Hi Irishboy.

I use the material used for nut milk bags. It's 135 microns, very fine and
seems to not slow the incoming air down at all..

To be exact, this - - - http://cgi.ebay.co.uk/NUT-MILK-BAG-MYLK-MESH-STRAIN-SPROUTER-RAW-FILTER-JUICE-/380153224547?pt=LH_DefaultDomain_0&hash=item5882e5dd63

Pantyhose or cheese cloth.

I'd just use pantyhose.

Shop vac filter might work better then pantyhose...