March 24, 2023
First, different functions.
Pre filter: Mainly used for filtering dust particles above 5μm, suitable for the Pre filter of air conditioning system;
Mid filter: belongs to F series of air filter, generally bag filter, including F5, F6, F7, F8, F9 grade. Intermediate filter is widely used in air conditioning system, mainly 1 for filtering more than 1-5um dust particles;
HEPA filter: mainly used to catch particulate dust and various suspended matter, less than 0.5um.
Second, different materials.
Pre filter: Outer frame material including paper frame. Aluminium frame. Galvanized iron frame, filter material including non - woven fabric. Nylon mesh. Activated carbon filter material. Metal hole mesh;
Mid filter: bag type, frame type, combined type, etc.;
HEPA filter: Using ultrafine glass fiber paper as filter material, offset paper. Aluminum film and other materials as a partition plate, and wood frame aluminum alloy bonded.
Third, different filtering accuracy and speed.
Pre filter: G1 ~ G4 5 micron 65%, 80%, 90%, 95%;
Mid filter: F5 ~ F9 1 micron 60%, 70%, 80%, 90%, 95%;
HEPA filter: H10 ~ H14 0.5 micron 95%, 99.5%, 99.95%, 99.995%, 99.9995%
