Diffusion: Really Good particles measuring down below 0.one micron get bounced around randomly and therefore are slowed by their interactions with atmospheric atoms and molecules. They at some point drift or get bounced into a filter fiber, whereupon (another time) they stick within a procedure known as diffusion. จัดส่งฟรี! เมื่อสั่งซื้อเครื่องกรองอากาศทุกรุ่น Successfully Submitted (Awaiting Approval)