Air Filter and Box Fan
Since the mold, pollen and air seems to be so bad this year, I was theorizing that if I used a very good air filter and attached it to a box fan, my air quality would get better. I used the Filtrete Healthy Living Elite Allergen Reduction Filter, MPR 2200. These cost about $15 on Amazon.
As you can see from the picture, this simple setup is doing an excellent job at filtering our the small particles in the air.
While you could use this in your furnace, I’ve found that it reduces the air flow quite a bit. I ended up putting one of these filter fans upstairs and one downstairs.
It’s interesting that my wife’s allergy symptoms have abated since using this filter setup.