HEPA
Videos
HEPA is an efficiency standard of air filters. A HEPA filter is an air filter meeting such a standard.
A portable HEPA filtration unit used to clean air after a fire, or during manufacturing processes
Hospital staff modelling a powered, air-purifying respirator (PAPR) fitted with a HEPA filter, used to protect from airborne or aerosolised pathogens such as tuberculosis
HEPA original filter for Philips FC87xx-series vacuum cleaners
Corsi–Rosenthal Box
Videos
The Corsi–Rosenthal Box is a design for a do-it-yourself air purifier that can be built comparatively inexpensively. It consists of four or five HVAC particulate air filters that form a cube and a box
HEPA
…filters during the COVID-19 pandemic, a professor at University of California, Davis, created a simple do-it-yourself air purifier design called crbox(Corsi–Rosenthal Box). It involves arranging 4 MERV-13 filters in a cubic shape, the bottom being made out of cardboard, sealing the filter sides with tape and adding a fan…
An example of a homemade unit
Richard Corsi in 2022
Students with decorated Corsi–Rosenthal Boxes at a competition at University of California, Davis in 2022