Articles

Here is another version of the Mini Corsi-Rosenthal Box. It takes about 10 minutes to build. It has a small “footprint”. It is quiet – just 19 dBa. And the fans are rated at 104 cfm. Perfect for an office, bedroom, examining room or any other critical space where two or more people are in … More

The first Corsi-Rosenthal Box was built in August of 2020. It was presented as an “open source” concept so that as many people as possible could have low-cost cleaner, safer indoor air. It is based on sound engineering principles, but it is really very simple. Use 4 (or 5) MERV 13 filters in a “box” … More

By Jim Rosenthal In a previous article I summarized tests conducted using Corsi-Rosenthal Boxes with MERV 13 Filters at very high Air Change Rates. It was determined that two Corsi-Rosenthal Boxes could reduce particle counts in a small office to Class 10,000/ISO 7 levels in less than 15 minutes. Could Corsi-Rosenthal Boxes Reduce Particles to … More

By Jim Rosenthal As we have seen in numerous tests, Corsi-Rosenthal Boxes with MERV 13 filters have been shown to outperform HEPA Air Cleaners in particle removal – on all particle sizes. Given the difference in single pass efficiencies, this does not seem possible. After all, a HEPA is at least 99.97% efficient on all … More

In order to determine how air filters help to remove particles in a space, it is important to understand that filter effectiveness is not the same thing as filter efficiency. As it is currently defined, filter efficiency refers to the ability of a filter to capture particles in a single pass test. Filter effectiveness refers … More

By Jim Rosenthal Much of the Eastern United States is covered with wildfire smoke from the massive fires in Canada. A very effective way to avoid this respiratory hazard is to keep the windows closed and use an air cleaner – like a Corsi-Rosenthal Box. One word of caution – use the right filters. We … More

By JIm Rosenthal The most frequently asked question we receive on the Corsi-Rosenthal Box is: “When do you change the filters?” Of course – the answer is – it depends. There are a number of variables that need to be considered like – the quantity and type of particle exposure, the type of filters used, … More

By JIm Rosenthal One of the best things about being involved in this Corsi-Rosenthal Box project is to see the tremendous amount of ingenuity, creativity, applied knowledge and technical skill shown by the many people who have built different versions of this DIY air cleaner. It is a continually evolving process and proof that a … More

The most enjoyable part of being a part of this “movement” to create DIY air cleaners is seeing the energy, creativity, knowledge and spirit to provide better and safer indoor air. As Thomas Thalhelm said several years ago, “an air cleaner is just a fan and a filter.” So true. But who could have imagined … More

The air you breathe in your car or truck is potentially some of the worst you will encounter on a daily basis. The relatively small cabin volume and proximity of the driver and other passengers make for one of the highest risk environments for the transmission of an airborne disease. Opening windows is always a … More