A filtration device constructed from cardboard tubes originally designed for bathroom tissue and an air-permeable medium, typically a furnace filter, can function as an air purification system. This system relies on the increased surface area provided by the cylindrical configuration of the tubes to capture particulate matter from the air as it is drawn through the filter.
The potential advantage of such a system lies in its accessibility and cost-effectiveness, utilizing readily available materials. The historical context often stems from scenarios where conventional air filters are unavailable or unaffordable. While demonstrating a capacity for particulate removal, it is important to acknowledge that the efficiency and longevity of this type of makeshift filtration are often significantly lower than commercially manufactured air filters designed for the purpose.
