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What you don’t know about high efficiency air filters (HEPA air filters)?

2022-04-19 Page view : 19 views

A Brief Overview of High Efficiency Air Filters (HEPA Air Filters):

The high-efficiency air filter is mainly used to capture particulate dust and various suspended solids below 0.5um. The air purifier is mainly composed of a filter element and a shell. The basic requirements are high filtration efficiency, low flow resistance, and continuous use for a long time to reduce the cost of later consumables.


High Efficiency Air Filter (HEPA Air Filter) Selection Points:


1.) The main control parameters selected by the high-efficiency air filter are filtration efficiency, rated air volume, initial resistance at rated air volume, dust holding capacity, etc. High Efficiency Air Filter HEPA Filter with Separator manufacturer, tested according to the method specified in GB/T6165-1985 “High Efficiency Air Filter Performance Test Method Transmittance and Resistance”, its transmittance ≤ 0.1% (ie efficiency ≥ 99.9%) Or a filter with a count transmittance of particles with a particle size of ≥ 0.1 μm ≤ 0.001% (ie efficiency ≥ 99.999%) is a high-efficiency air filter.

2.) The commonly used filter materials for high-efficiency air filters are ultra-fine glass fibers.

3.) The air filter should meet the fire protection requirements. The high-efficiency air filter is divided into three levels according to the degree of fire resistance: the first-level filter, all the materials of the filter are non-combustible, and the non-combustible material should meet the GB8624-2012 grade A. Class 2 filter, the filter material should be non-combustible material that conforms to GB8624-2012 class A, and the partition plate and frame can be made of combustible material conforming to GB8624-2012 class B2. 3-stage filter, all filter materials are available in line with GB8624-2012 B3 level.

4.) When designing, the final resistance can be twice the initial resistance as the calculated resistance of the filter.

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

6.) The high-efficiency air filter should not be used alone, and the high-efficiency air filter should be set at the end of the purification air-conditioning system.

7.) The dust holding capacity should be provided by the manufacturer. The high-efficiency filter should be leak-tested when it leaves the factory. Other requirements are determined according to user needs.

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


High Efficiency Air Filter (HEPA Air Filter) Application:

It can be widely used in the air supply at the end of the air conditioner in the dust-free purification workshop of 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 structural forms can be divided into: high-efficiency with partitions, high-efficiency without partitions, high-efficiency air volume, ultra-high-efficiency filters, etc.