By Jim Rosenthal Since the first Corsi-Rosenthal Box Air Cleaner was made in August of 2020, we have received many questions about the necessity of using new, fully-assembled filters in each filter change. So we have developed an alternative using permanent metal frames. Instead of changing all of the filters by reassembling the CR box … More
Articles
Testing the Efficiency of MERV 13 Corsi-Rosenthal Boxes In Use
By Jim Rosenthal Many tests have been done on Corsi-Rosenthal Box air cleaners showing very high levels of efficiency and effectiveness. The MERV 13 filters used in these DIY devices use electret media. This media is designed to increase efficiency on small particles with less resistance and higher air flow. A long running debate in … More
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 … More
Air Cleaner Effectiveness Determined by Filter + Fit + Flow
The main reason to use an air cleaner is to remove particles – the higher the particle removal rate, the more effective the air cleaner. What factors determine effectiveness? The first element is the FILTER. An efficient filter is critical. But, the filter is only as good as the construction of the air cleaner. The … More
IAQ Research-Practice in Action: The Corsi/Rosenthal Box Air Cleaner
By Jim Rosenthal Introduction: This is the story of how the knowledge and creativity of a researcher (Dr. Richard Corsi) and the practical experience of the CEO of an air filter company (Jim Rosenthal) combined to develop an extremely effective and inexpensive air cleaner. This open source design has been used extensively in schools, churches, … More
New Air Cleaner using Advanced ELGIT System Reduces Viruses, Mold and Bacteria by 93%
By Jim Rosenthal, CAFS At last, an air cleaner that is safe, inexpensive, reliable, quiet, and energy efficient. This remarkable product uses the new and advanced Electronic Green Incandescent Technology (ELGIT) system. Tests show that the ELGIT air cleaner reduces viruses, mold, bacteria and other indoor contaminants by 93%! The perfect product for schools, offices … More
Comparing Filters for Resistance and Efficiency
By Jim Rosenthal, CAFS Several years ago I wrote an article for this website comparing different commonly available filters for resistance and efficiency (at 0.3um). The article continues to be one of the most popular on our site. There just aren’t many places where one is able to compare filters from various manufacturers. Somehow it … More
It’s All About the Air Flow Through the Filter
By Jim Rosenthal, CAFS Users of air filters – whether they are residential or commercial – are not interested in filter efficiency. Efficiency is just a number. What they are interested in is whether or not an air filter will protect their HVAC system and provide better indoor air quality in their home or building. … More
How to Improve the Efficiency of the Corsi-Rosenthal Box Air Cleaner
By Jim Rosenthal Several months ago I wrote two articles for this site on the “Box Fan and MERV 13 Filter” air cleaner. They have been viewed over 30,000 times and many people have built these air cleaners following the simple directions in the articles. They are easy to construct, inexpensive and effective. In short, … More
A Variation on the “Box Fan with MERV 13 Filter” Air Cleaner
The “Box Fan with a MERV 13 Filter” air cleaner is an easy-to-assemble, inexpensive and effective way to improve indoor air quality and to reduce exposure to Covid-19. The concept is really simple – attach an effective air filter to a box fan and clean the air. This article gives more details about the construction … More