Last year for Christmas gatherings at my dad's house I put together wall-mounted filter cubes, to get them up and out of the way. This time around this seemed like too much hassle, so I put one together on top of the piano, one in a bookcase, and used one commercial purifier:

It's double-ended because I had an extra fan. You do need to remember to turn on both fans. Probably would be slightly more effective if I'd put a partition in the middle to make it actually be two independent cubes. I used the 12x20 filters from my ceiling fan air purifier project.

The kitchen has a commercial purifier, which has a similar capacity to the filter cubes while taking less space. If I wanted to run these all the time I might buy several commercial purifiers, but since these are just for occasional use that seems less worth it.

For the living room, Julia had the clever idea of using a part of the built-in shelving that was exactly the right size:

This is only two filters worth, but I still feel a lot of airflow from the fans. It's a good location for not being in the way, though we did need to talk to the kids about leaving it alone since it would be easily damaged if bumped.

I should make some shrouds for the fans.

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Interesting topic. Do you feel anecdotally any differences in your wellbeing with abundant filtering? Significantly better breathing? Is your city significatly polluted?

Not pollution (Boston is fine) but reducing covid risk for elderly relatives