General principles of HEPA Filter selection

General principles of HEPA Filter selection
HEPA Filter--mainly used to capture particle dust below 0.5um and various suspended solids. 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 plates, which are glued with the wooden frame aluminum alloy. Each unit has been tested by the flame retardant method, and has the characteristics of high filtration efficiency, low resistance and large dust holding capacity.
 
HEPA Filter is widely used in the air-conditioning end air supply of dust-free purification workshops in optical electronics, LCD liquid crystal manufacturing, biomedicine, precision instruments, beverages and food, PCB printing and other industries. Both high-efficiency and ultra-high-efficiency filters are used at the end of the clean room, and their structure can be divided into: high-efficiency with partitions, high-efficiency without partitions, high-efficiency air volume, ultra-high-efficiency air filters, etc.
 

 
General principles of HEPA Filter selection:
1. Import and export diameter:
In principle, the inlet and outlet diameter of the filter should not be smaller than the inlet diameter of the matching pump, which is generally the same as the diameter of the inlet pipeline.
 
2. Nominal pressure:
Determine the pressure rating of the filter according to the highest possible pressure in the filter line.
 
3. Selection of the number of holes:
The main consideration is the particle size of impurities to be intercepted, which is determined according to the process requirements of the medium. For the particle size that can be intercepted by wire meshes of various specifications, please refer to the table "Filter Specifications".
 
4. Filter material:
The material of the filter is generally the same as the material of the connected process pipeline. For different service conditions, the filter of cast iron, carbon steel, low alloy steel or stainless steel can be considered.
 
5. Calculation of filter resistance loss
For water filters, the pressure loss is 0.52～1.2kpa under the general calculation of rated flow rate