The main difference between primary air filter, medium  efficiency air filter and high efficiency air filter lies in the difference in filtration efficiency, use, function, material and speed. In the system, the primary filter is designed to reduce the filtration pressure of the intermediate filter, while the primary filter and the intermediate filter are designed to reduce the pressure of the high-efficiency filter and improve the service life of the high-efficiency filter. Yes, because the price of high-efficiency filters is much higher than that of primary and medium-efficiency filters.
1. Different uses:
Primary filter: suitable for primary filtration of air conditioning system, or coarse filter end of multi-stage filtration system;
Medium-efficiency filter: mostly suitable for intermediate-level filtration of air-conditioning systems;
High-efficiency filter: generally used for the final filtration of dust-free filtration systems with higher requirements.
2. The application scenarios and functions are different:
Primary filter: mainly used to filter dust particles above 5μm.
Medium-efficiency filter: mainly used to filter dust particles above 1-5um.
High-efficiency filter: mainly used to capture particle dust below 0.5um and various suspended solids, with high filtration efficiency, low resistance and large dust holding capacity.
3. The optional materials are also different:
Primary filter: The outer frame materials include paper frame, aluminum frame, galvanized iron frame, and the filter material includes non-woven fabric, nylon mesh, activated carbon filter material, metal mesh, etc.;
Medium efficiency filter: bag type, frame type and combined type, etc.;
High-efficiency filter: The ultra-fine glass fiber paper is used as the filter material, and the offset paper, aluminum film and other materials are used as the dividing plate, which is glued with the wooden frame aluminum alloy.
4. The filtering accuracy and speed of the three are different:
Primary filter: G1-G4 5 microns 65%, 80%, 90%, 95%;
Medium efficiency filter: F5-F9 1 micron 60%, 70%, 80%, 90%, 95%;
High efficiency filter: H10-H14 0.5 micron 95%, 99.5%, 99.95%, 99.995%, 99.9995%.