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January 25, 2022 By Jim Rosenthal

A Mini Corsi/Rosenthal Box Air Cleaner

By Jim Rosenthal

Many people have asked for a smaller version of the Corsi/Rosenthal Box Air Cleaner. In the spirit of the “open source” cooperative approach there have been several versions pictured on Twitter. These excellent examples inspired me to build one myself. Here is the result – a Mini-Corsi/Rosenthal Box!

The fan is a readily available 9″ box fan ($21.99). The filters are MERV 13 – 10″X10X2″ (9 1/2″X9 1/2″X13/4″) from Tex-Air Filters ($10 each). We used white duct tape.

Mini CR Box efficiency (as measured with a Lighthouse Handheld 3016-IAQ) results were the following:

Particle SizeAmbientAt Fan% Efficiency
0.3 um2824500144300048.91%
0.5 um45820020250055.81%
1 um26800820069.40%
2.5 um120020083.33%
5 um2000100.00%
10 um1000100.00%

These filter efficiencies are comparable to other test data and other measurements taken with full size Corsi/Rosenthal boxes.

This Mini Box Fan has three speeds – Low, Medium and High. Here are the test results for each speed.

SpeedsFPM at Fan Noise LevelCFM at FanCADR est. SmokeCADR est. Dust
Low38545 dB18875.2131.6
Medium45449 dB22288.8155.4
High48052 dB23594164.5

CADR is calculated on the basis of CFM times 0.40 for smoke and CFM times 0.70 for Dust.

All in all, the Mini Corsi/Rosenthal box is an excellent option for smaller rooms like individual offices, small bedrooms, nurseries, hotel rooms and other areas where the full power of the regular CR box is not needed. It is relatively quiet – yet powerful enough to move a substantial amount of air – definitely a viable DIY option. It works!

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Filed Under: Articles Tagged With: corsi/Rosenthal box, mini

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