High efficiency particulate air (HEPA) filters satisfy a certain level of efficiency. It removes more than 99.95% of the dust particles from the air passing through it. Its efficiency varies for different ranges of sizes of particles. Main component of HEPA is its randomly arranged fibres which are mainly fibreglass and have diameters between 0.5µ to 2µ. Unlike membrane fibres, where particles as wide as the largest opening cannot pass through them, HEPA filters are designed to target much smaller pollutants and particles.
Functions:
· Diffusion
· Interception
· Impaction
· Electrostatic attraction