1. The main control parameters selected by the high efficiency air filter are filtration efficiency, rated air volume, initial resistance under rated air volume, dust holding capacity, etc.　　

2. According to the method specified in GB/T6165-1985 "High efficiency air filter performance test method Transmittance and resistance" The filter with counting transmission rate ≤ 0.001% (that is, efficiency ≥ 99.999%) is a high-efficiency air filter.　　

3. Commonly used filter materials for high-efficiency air filters are ultra-fine glass fibers.　　

4. The air filter should meet the fire protection requirements. The high-efficiency air filter is pided into three levels according to the degree of fire resistance: level 1 filter, all materials of the filter are non-combustible, and non-combustible materials should comply with GB8624-1997 level A. For level 2 filters, the filter material should be a non-combustible material that meets GB8624-1997 Class A, and the partition plate and frame can be used with a flammable material that meets GB8624-1997 Class B2. 3-level filter, all materials of the filter are available in line with GB8624-1997 B3 level　　

5 When designing, double the initial resistance can be used as the final resistance as the calculated resistance of the filter.　　

6 The initial resistance of the high-efficiency air filter shall not exceed 10% of the resistance of the product sample.　　

7 The high efficiency air filter should not be used alone, and the high efficiency air filter should be installed at the end of the purification air conditioning system.　　

8 The dust holding capacity should be provided by the manufacturer. High-efficiency filters should be leak-tested when they leave the factory. Other requirements are determined according to user needs.　　

9 In general non-parallel flow clean air conditioning systems, combined filter vents are often used.