Filters remove what size of contamination particles?

• A. Coarse particles
• B. Fine particles
• C. Large particles
• D. Ultra-fine particles

Answer: (B)

Filters remove fine particles. Air passes through a filtration media that traps particles by several mechanisms: large particles are knocked out by impaction as they collide with fibers, mid-sized particles are intercepted as they follow the air stream, and very small particles are captured by diffusion as they move erratically and eventually contact a fiber. This combination makes filters particularly effective at capturing fine particles, which are small enough to remain suspended but still within the range the media is designed to trap. Ultra-fine particles are often more challenging and may require more specialized media, while large/coarse particles are typically captured readily as they collide with the fibers. So the best description of what most filters primarily remove is fine particles.