DIY box fan + 20" filter.

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I went out and bought a fan. There is not much selection out there yet, so I got the only one I found at Lowes, a Lasko for $15. I know it's not high quality, but it's cheaper than the Filtrette filter ($20). I figure it can get me started for now, until I find a good one. I taped the filter to the fan and it's been running for about one hour, we'll leave it one for about another hour and we'll see what the effect is.

Thanks all for advice.