If you don’t care about looks, grab yourself four 20x20x2” furnace filters of your preferred rating (merv 13), a 20” box fan for $20 and some duct tape. Assemble into a cube with the fan on top and filters on the sides. Add a cardboard cutout to the bottom if you want. Make sure you orient the fan and filters so that airflow comes into the filters (sucked) and out through the fan. Replace filters every year or less if you use it constantly.
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