Older buildings need innovative retrofit solutions to improve indoor air quality. This study showed that a low-cost unit, made of a simple box fan with a MERV13 filter taped to it may perform as well at removing particles from a room as a high-cost HEPA filter unit.
MERV-13 filters and box fan is a low-cost alternative to commercial filter units. The Low-cost method effectively filters wildfire PM2.5 and submicron particles.
