What is the difference of hepa a and hepa b?

HEPA A and HEPA B refer to different classifications of High-Efficiency Particulate Air (HEPA) filters based on their efficiency and application. HEPA A filters typically meet the standard for filtering out 99.97% of particles that are 0.3 microns in size, making them suitable for general air purification. HEPA B filters, on the other hand, are designed for more specialized applications, often achieving higher efficiency rates and filtering smaller particles, making them ideal for use in medical or industrial settings. The specific standards and regulations governing these classifications can vary by region and organization.