High efficiency air filter is mainly used to intercept particulate dust less than 0.5 and some suspended solids. Ultrafine fiber media is used as filtration material. It is very useful for air supply at the end of air conditioners in dust-free purification workshops of optical electronics, LCD liquid crystal manufacturing, biomedicine, precision instruments, beverage and food, PCB printing and other industries.

High efficiency and ultra-high efficiency filters are both used at the end of the clean room. They can be divided into high efficiency filters with baffles, high efficiency filters without baffles, high efficiency filters with large air volume, and ultra-high efficiency filters.

1） The test shall be carried out according to the method specified in ISO29463 Test Methods for Performance of High Efficiency Air Filters - Permeability and Resistance. 

The filter with a transmissivity not greater than 0.1% shall be a high efficiency air filter.

2） The main control parameters selected for high efficiency air filter are filtering efficiency, rated air volume, initial resistance under rated air volume, dust capacity, etc.

3） In general non parallel flow clean air conditioning systems, combined filter outlets are often used.

4） The HEPA filter should not be used alone, and should be set at the end of the purification air conditioning system.

5） During design, the final resistance can be twice the initial resistance, which can be used as the calculated resistance of the filter.

6） The initial resistance of the HEPA filter shall not exceed 10% of the product sample resistance.

7） The dust capacity shall be provided by the manufacturer. The high efficiency filter shall be leak checked when leaving the factory. Other requirements shall be determined according to the user's needs.