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    With the continuous development of science and technology, the air quality of our life is getting worse and worse, making modern industrial production and scientific experiment activities of indoor air cleanliness is getting higher and higher. In particular, the medical industry requires miniaturization, refinement, high purity, high quality and high reliability of the indoor environment, which has high requirements for the performance of air filters.

    At present, the main way to achieve this requirement is to widely use air filters in clean air conditioning systems.     The performance of various types of air filters is directly related to the grade of clean operating room. So, what are the types of air filters? What about its performance and adaptability?

 Classification of air filters in clean operating rooms 

    Removing dust from the air relies on air filters. Filter is the core equipment in the process of air purification. The purification system is usually equipped with three stage air filtration. The first stage is at the fresh and return air outlets, the second stage is at the positive pressure section of the system, and the third stage is at the supply air end.

    There are many kinds of filter, according to our national standard GB50073-2013 "clean factory design specification", the air filter is divided into four categories according to the following indicators:

 First, the primary air filter 

    Primary filter is the first level filter in air conditioning and purification system. It can also be used alone, as an air intake filter for ordinary air conditioning systems. All ventilation, air conditioning and purification systems with medium and high efficiency filters should be installed with primary filters.

    The primary filter is mainly used to filter dust with particle size of more than 5um and various foreign bodies. It is suitable for the primary filtration treatment of simple air conditioning purification system and ventilation system and the occasions with high dust concentration.

    Paper frame pleated filter, filter media is made of non-woven cotton and synthetic fiber by special blend, has the advantages of high dust capacity, low initial pressure loss, large air volume. The composite metal mesh provides the largest filter area for the air flow, and its filter area is 5 times that of the general plane filter. Humidity resistance up to 99%; Temperature resistance 80℃.

    Mainly filter dust particles ≥5μm, used in commercial and industrial ventilation system, air conditioning system pre- filtration.

 Second, medium effect air filter 

    In the air conditioning system, the medium effect filter is commonly used in the back of the primary effect air filter to improve purification efficiency, and in front of the high efficiency filter to extend the service life of the high efficiency filter.

    The filter object of medium-effect filter is 1μm~5μm dust. The filter materials of medium effect filter mainly include polyester non-woven fabric, polypropylene non-woven fabric, medium cell foam plastic, fine cell foam plastic and medium effect glass fiber filter paper. The outer frame adopts special aluminum profile and galvanized steel frame.

    Medium effect filter has the characteristics of strong tension, small resistance, large air volume and large filter area. It is suitable for intermediate filtration of air conditioning and air conditioning purification and occasions with high dust concentration. Medium filter is the most used bag structure, cleaning or replacement cycle is long.

    Bag medium effect filter is suitable for intermediate filtration of air conditioning system, located in front of high efficiency filter, mainly used to filter 1-5μm dust particles, in order to protect the system filter and the system itself. It has the advantages of small resistance and large air volume. The optional styles are bag deep, frame type, combined type, etc.

 Product features: 

1. The filter material is made of high performance non-woven fabric with heat melting process, to avoid the discomfort of old glass fiber materials may cause to the human body;

2. The filter material contains electrostatic fiber, which has a particularly good filtering effect on sub-micron dust, with high dust capture rate, high air permeability, high dust load and high service life;

3. Filter material density increased step by step to increase the amount of dust, improve the service life of the product

4. Low initial resistance, high efficiency;

5. The appearance color uses uniform identification, easy to identify.

 Third, HEPA filter 

    High efficiency air filter is the last stage filter in the purification system. The filter object is mainly 0.3μm~1μm dust.

    For particles greater than or equal to 0.3um, the filtration efficiency is greater than or equal to 99.9%. Specifically can be divided into: V-bank filter, separator filter, mini-pleated filter.

    V-bank filter, using acrylic filter paper and glass fiber filter paper as filter material, hot melt glue and silk wire as separator, outer frame plastic and plastic frame glued together. It has a large filtration area, low resistance, rated air volume and other characteristics, the general filtration efficiency of 99.97%~99.99%.

    Mini-pleat HEPA filter, using thin glass fiber as filter material, hot melt adhesive as separator, metal protective mesh and filter material frame configuration, with high filtration efficiency. HEPA filter efficiency is 99.995% (0.3μm particles), ULPA filter efficiency is 99.9995% (0.1μm~0.2μm particles). Suitable for Class100-Class1000 class clean room and clean room terminal filtration device with high cleanliness rate requirement.

 Fourth, electrostatic air filter 

    Electrostatic air filter can effectively collect dust of different particle sizes suspended in the air. In particular, 0.1μm~0.01μm particles that are difficult to be removed by ordinary air filtration can be removed by electrostatic filters.

    Electrostatic filters also have the function of sterilization. Experiments show that the bacterial cysts are negatively charged. When entering the electrostatic filter's high voltage electric field, they are first polarized and positively charged. Then they enter the dust collection area and are absorbed by the high voltage electric field, and the bacterial cysts are neutralized and decomposed, thus achieving the effect of sterilization.

    In order to ensure the good effect of surgical cleanliness, professional businesses should be consulted in the design of clean operating rooms. Understanding the performance of various air filters, reasonable optimization combination, in order to ensure the purification efficiency under the premise of achieving a reasonable cost performance.

    And before installation, all kinds of filters are scanned for leak detection. After installation, leakage detection is carried out on the connection and compaction sealing parts to ensure the absolute reliability of the seal. Check the primary, medium and high filters regularly during use to ensure the normal operation of the filter system.