Corsi-Rosenthal Box Update

The Corsi-Rosenthal Air Filter Box, aka the Comparetto Cube, has become the talk of the town ever since the notion of airborne pathogens forced us, courtesy of SARS CoV-2, to get more serious about the finest particles, which normally escape most commercial filters.

In most of these situations, there is an eternal battle between greater performance and energy efficiency. In this case, as you are upgrading filter performance, by the time you reach MERV-13, you might need as much as the equivalent of a 15-20 MPH wind to overcome the resistance of the filter. Upgrading your filters, therefore, leads to increased wear and tear on equipment, higher energy bills, and lots more trash from exchanging the filters. The experience with the Corsi-Rosenthal box is a good demonstration.

One way of overcoming the greater resistance from tighter filtration is to expand the filter surface. The Corsi-Rosenthal solution uses four filters instead of one for that exact reason, as per this article on box-fan filter performance. In the article, there is a useful graph showing just how increasing the filter area reduces the wind resistance.

The Dexwet filter which we are introducing to the US market, works on a very different principle, using a low-surface tension liquid to capture the small dust particles, PM1, PM2.5 up to PM10 in a filter frame of perforated tubes, producing little or no air-resistance, but instead relying on minor diversions of the air stream within the filter frame to expose the small dust to an absorber fluid, where it is absorbed and sealed off from the air and furthermore rendered harmless. It can be used as either a pre-or post filter or in some situations a complete replacement of legacy filter materials. In short, we are proposing a solution that reduces energy consumption, waste, and maintenance while providing 99% effectiveness in eliminating small dust, including all known airborne pathogens, including viruses, bacteria, mold and mildew spores etc. Service cycles in typical installations can be 6-12 months, depending on the level of air quality desired, and in some situations even up to 18 months.

Some more references:

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