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Most box fans are not designed to have enough oomph for something like a Filtrete filter. They are only rated for about an inch of pressure.
Electrostatic filter on the furnace/AC is a good step. A multi speed HEPA unit advertised for a large family room is what I would put in a sufferers bedroom. Consumers Reports is one of the few places that has ratings for noise, about all I would look for in a recommendation of filter units.
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I'm a big fan of the 20" fan and filter. It gets the gross dust out of the air which lowers the load on all the other filters. You can buy some sort of plastic channels and screw them onto the fan to slide the filter in, but I just use duct tape.
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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.
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If the allergies are dust mite related, low humidity is the key. Now, if the child also has asthma, higher humidity helps, which is where the catch 22 comes into play in my home. Oh, and the cats........
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Filter on the intake side will help protect the fan motor too.
If your son would benefit from higher humidity, look into a Venta AirWasher. They're virtually silent and, clean the air in the room while adding moisture. If you go this route, stick with the smallest size recommended. The large unit really raises the humidity level of the room its in.
