CR Box Fan

This is the first box, built around December 2021 and rebuilt in September 2022 with new filters. Figure 2 shows the difference between a new and used filter.

This original box was largely used in an open basement. The box fan is a 20in. Hurricane which works well becuase the control is accessible, but it is louder than I’d like. The fitlers are 3M Filtrete 1900.

My original CR Box

Rebuilt CR box with new filters

Figure 1: CR filter after 8 months of use.

Figure 2: Comparison of New/Used filters