G3 pre-filter mainly through the physical filtration mechanism ** to intercept and remove particles in the air, its specific working principle is as follows:
1. ** Interception effect ** : When the air passes through the G3 pre-filter, the larger particles will directly impact the filter fiber under the push of the air flow due to its own inertia, so as to be intercepted and adhered to the surface of the filter material. For example, when dust, hair, pet dander and other large particles in the air pass through the filter, they will be blocked by inertia and contact with the filter material [^4^].
2. ** Screening effect ** : There are certain gaps between the fibers in the filter material, and these gaps form countless tiny channels. When the air passes through these channels, particles smaller than the gap size can pass through, and particles larger than the gap size will be blocked on one side of the filter material, so as to achieve the screening of particles. The large fiber gap of the G3 pre-filter allows smaller particles to pass through while intercepting larger particles [^4^].
3. ** Electrostatic adsorption (some exist) ** : Some G3 pre-filter filter media will carry static electricity, and some particles in the air will also carry electric charges. When the charged particles pass through the filter material, they will be attracted by static electricity and be adsorbed on the filter material, thereby improving the filtration effect. However, this electrostatic adsorption is relatively weak and is not the main filtering principle of the G3 pre-filter [^4^].
4. ** Diffusion (small contribution) ** : For some very small particles, their motion in the air is similar to the Brownian motion of molecules, with randomness. When these small particles move to the vicinity of the filter fiber, due to the collision of gas molecules and other reasons, they may deviate from the original direction of movement, collide with the filter fiber and be adsorbed, this effect is called diffusion. However, in the G3 pre-filter, the contribution of diffusion to the filtering effect is relatively small [^4^].
In summary, the G3 pre-filter works together through a variety of mechanisms to effectively intercept and remove particles in the air, providing initial protection and filtration effects for the subsequent air purification process.