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How to install the primary air filter _ installation steps of the primary air filter

www.clean-link.cn
2021-03-04

Primary filters are generally used for clean sites with low environmental requirements, and can also be used as pre-filters for medium and high efficiency filters to increase the service life of medium and high efficiency filters. Primary filters mainly filter dust above 5um and are widely used as air filters. 
At present, the primary air filter is mainly divided into primary effect plate filter, primary effect folding filter, primary effect paper frame filter, primary effect nylon net filter and primary effect bag filter, etc. the filter materials used are mainly polyester synthetic fiber, also known as air filter cotton, nylon mesh and activated carbon.

How to install the primary air filter

So how do we need to install the primary filter in order to give full play to its filtering effect? 
Installation steps of primary filter. 
1, before the installation of the primary filter, be sure to clean, scrub, air conditioning purification system software inside the cleaning room if there is ash accumulation, should be cleaned again, scrub, exceed the cleaning regulations. When the initial filter is installed in the technical compartment or decoration ceiling, omni-directional cleaning and scrubbing should also be carried out in the technical compartment or decoration ceiling. 
2. After the cleaning room and air conditioning purification system software exceeds the cleaning regulations, the air conditioning purification system software must be run on a trial basis. Run continuously for about 12 hours, clean and scrub the purification room again and install the primary filter immediately. 
3. Before the initial filter is installed, be sure to disassemble the package on the spot and carry out appearance check, including filter paper, sealant and frame with rough edges and rust (metal material frame): whether there is a product qualification certificate, whether the technical characteristics are in line with the requirements of the design scheme. Leak detection is then carried out. Those who pass the leak detection after regular inspection should be installed first. During installation, effective preparation should be carried out according to the friction resistance dimensions of each filter. For unilateral flow, the distance between the rated friction resistance and the average friction resistance of each filter on the same air outlet or exhaust surface should be less than 5%. 
4. The framework for installing primary filters should be leveled. The allowable error of the installation frame flatness of each primary filter does not exceed 1mm. And keep the outer frame of the filter with arrows consistent with the orientation of the cyclone. When it is installed vertically, the wrinkles of the filter paper should be vertically evenly divided into the road surface. 
5. When sealing gaskets, rod glue, air pressure tightness, liquid tank tightness and double-ring tightness are generally selected for the sealing between the primary filter and the frame, the filler surface, the outer frame surface of the filter, the frame surface and the liquid tank must be scrubbed neatly. The thickness of the sealing gasket is not suitable for exceeding 8mm, and the compression coefficient is 25% to 30%. The way and material of the connector shall be in accordance with the design scheme, and there shall be no leakage at each interface of the frame.When using double-ring sealing tape, there is no need to plug the hole in the ring cavity when sticking sealing; double-ring sealing and air pressure sealing must maintain the air pressure pipeline unobstructed. 


Precautions for installation of primary filter. 
Before installing the primary filter, the clean room must be cleaned and cleaned. If there is dust in the air conditioning system, it should be cleaned and cleaned again to meet the cleaning requirements. If the primary filter is used in the air duct, the air duct needs to be cleaned after the primary filter is removed. Because there will be dust during the disassembly and assembly of the primary filter, if the air duct is not cleaned, then the next time the fan is turned on, some of the dust will go directly into the clean room, causing air pollution. If the above situation occurs, it is suggested that after the clean room and the clean air conditioning system meet the cleaning requirements, the clean air conditioning system must be put into trial operation. After running continuously for more than 12 hours, clean and clean the clean room again, install the primary filter immediately. 
Before installing the primary filter, the transport of the filter needs to be handled gently. During installation, you need to see with the naked eye whether the internal filter paper, sealant and frame of the primary filter are damaged; whether the side length, diagonal and thickness dimensions meet the requirements; whether the frame has burrs and rust spots (metal frame). During installation, reasonable allocation should be made according to the resistance of each primary filter. For unidirectional flow, the difference between the rated resistance and the average resistance of each filter on the same tuyere or air supply surface should be less than 5%. Medium effect filters should be installed if the cleanliness level is equal to or higher than 100 clean rooms. 
After the initial filter is installed, its frame should be flat. If the environment requires high cleanliness, the frame of the primary filter needs to be equipped with sealing devices such as gaskets. Finally, if it is an initial filter with cotton attached to barbed wire, the arrows on the outer frame should be consistent with the airflow direction during installation. When it is installed vertically, the crease seam of the filter paper should be perpendicular to the ground.

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