HEPA stands for High-Efficiency Particle Arresting, which is the standard
that achieves  99.9% air filtration. 99% of particles in the air are invisible to
the naked eye.  HEPA filter produced by Nantong Henka Environment
Solutions can capture up to more than 99.97% of pollutants from the air that
Passes through it, including cat dander, certain bacteria, pollens and more.
Features:   
1) High collecting efficiency
2) Low resistance to airflow
3) Low operating cost
4) Frame type:Cardboard,plastic and Aluminum