Understanding Bacterial Filtration Efficiency (BFE) and Mask Breathability
What is Bacterial Filtration Efficiency (BFE)?
Bacterial Filtration Efficiency (BFE) measures the percentage of bacteria filtered out by a mask. Essentially, it evaluates the mask's ability to prevent bacteria from passing through. A higher BFE indicates better filtration. For example, our PRO mask boasts an impressive average BFE of 99.72%.
How is BFE Tested?
To test BFE, a specific amount of bacteria is mixed with air to simulate real-life conditions. This mixture is then pulled through the mask at a constant rate for at least four hours. Due to the small size of individual bacteria and their tendency to cluster, colony-forming units (CFUs)—tiny clumps of bacteria—are counted instead. The BFE is calculated by comparing the number of CFUs that passed through the mask to the initial amount in the air mixture.
What is Differential Pressure (Delta P) and Why is it Important?
Differential Pressure (Delta P) measures the breathability of the mask. It ensures that the mask remains easy to breathe through while effectively filtering out bacteria. Delta P compares the effort required to inhale and exhale through the mask. Our PRO mask meets all manufacturing standards and quality regulations regarding Delta P, ensuring both effective filtration and comfortable breathability.
If you have any questions, please contact us by email at info@cambridgemask.com or Chat button on our sites to connect with our Customer Service Team.
