# philipn / Corsi-Rosenthal Cube testing results 5f8caa1ab5e649324dc9dad2879707d3a5571061

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This is a "scratch" page used to record various measurements and test results obtained for the Corsi-Rosenthal Cube.

## Room sizing / CADR figure

CFM measurements of a 4-sized cube configuration were taken here:

As per conversation with David Elfstrom, these figures were using a Lasko Power Plus fan, which puts out ~20% more flow than typical fan.

In David Elfstrom's own CADR predictions, he uses a figure of $$\~62\%$$ efficacy of the MERV-13 filters (confirmed with him). So this is a figure based on $$0.3um$$ particles expected lower bound performance with the MERV-13 filters.

COVID-carrying particles are likely larger than 0.3um (most penetrating particle size), so this is a lower bound figure. I am not sure if the exact size distribution of COVID-carrying particles is known. We know $$80\%$$ of them are are "less than $$5um$$."

Using John Semmelhack's CFM measurements, we can make a guess at the difference between the cube with 1" filters and the cube with 2" filters. His cube was constructed with 2" MERV-13 filters.

We assume a conservative figure here. Want to give a lower bound. So this scale multiple looks like $$(349/455)$$.

$$(349/455)*871*0.62*0.80 = 331 \text{ CADR}$$.

This is a "scratch" page used to record various measurements and test results obtained for the Corsi-Rosenthal Cube.

## Room sizing / CADR figure

CFM measurements of a 4-sized cube configuration were taken here:

In David Elfstrom's own CADR predictions, he uses a figure of $$~62\%$$ efficacy of the MERV-13 filters (confirmed with him). So this is a figure based on $$0.3um$$ particles expected lower bound performance with the MERV-13 filters.
COVID-carrying particles are likely larger than 0.3um (most penetrating particle size), so this is a lower bound figure. I am not sure if the exact size distribution of COVID-carrying particles is known. We know $$80\%$$ of them are are "less than $$5um$$."
We assume a conservative figure here. Want to give a lower bound. So this scale multiple looks like $$(349/455)$$.
$$(349/455)*871*0.62*0.80 = 331 \text{ CADR}$$.