Activated Carbon PM2.5 filter are suitable for all face masks and coverings that have a filter slot.
These filters have 5 layers:
Whats does PM2.5 mean?
PM2.5 refers to atmospheric particulate matter (PM) that have a diameter of less than 2.5 micrometers, which is about 3% the diameter of a human hair. (See images)
Commonly written as PM2.5, particles in this category are so small that they can only be seen with a microscope. They are even smaller than their counterparts PM10, which are particles that are 10 micrometres or less, and are also called fine particles.
Small: 10cm wide by 5cm high.
Large: 12cm wide by 7cm high.
This filter can not be cleaned and they are disposable.
For more information:
- www.gov.uk - View the section on Face-coverings
- SAGE - Scientific Evidence supporting the COVID-19 Response