When dust particles under 0.2 microns, such as gas arising from dust extremely small molecular thermal motion of Brownian motion, increase the dust and dust bag that contact, make the dust was set. The diffusion effect is opposite to the inertia effect, which increases with the decrease of the filter gas velocity, and the particle diameter decreases. In the case of fiberglass, the higher the fiber, the higher the dust removal efficiency (see table). But the pressure loss of fiber diameter is greater than that of coarse fiber, and the corrosion resistance is worse.
When dusty gas dust bag, close to the tiny dust still with airflow movement, if the radius of dust is greater than the distance form the centre of dust to dust bag edge, then the powder - dust is dust bag adhesion was arrested. The smaller the gap in the dust bag, the more significant the adhesion.