In the atmosphere there are particles of various sizes such as dusts, aerosols and exhaust gases. Some of these particles spontaneously form in nature, a vomit is a human structure with industrialization. Air pollution is known to cause serious damage to human health. Many industrial production, chemical physical and biological processes are known to cause this pollution. At this point, the importance of air filters arises. Filters are used not only for human health, but also as a means of processes. Standards have been established and laws have been enacted in this regard especially in the US and European countries. (EN - European Norm)

 

Types of Ventilation Filters
Cassette (Panel) Filter
Hepa Filter
High Temperature Filter
Activated Carbon Compact Filter
Activated Carbon Cartridge Filter
Compact Filter
Bag Filter
Metal Filter
Rigid Bag Filter
Cartridge Filter
Fan Coil Filter
You can view our clean air filter products.

There are 3 main criteria in the selection of air filters;

  • Percent Productivity: The efficiency of the filtration is determined according to EN 779 or EN 1822 standard for fine filters and this test determines the filter class. The size and percentage of particles retained by the filter.
  • Dust Holding Capacity: The filter with the same efficiency and high dust holding capacity will have a longer life than the other filter. 
  • Pressure Decrease: With the filter installed in the system, there will be a resistance in the system. The start of the filtration with low pressure differential will bring energy savings. 

When selecting in air filters, we need to know the particle distribution in the air present in the atmosphere. Secondly, what do we want to filter out of the particles? A coarse particle of size 5-10 micron, which disturbs us in the general particle distribution in the air, a filter of the G3 - G4 class can filter the second peak on the right in the figure below. In this way, 90% of the air we get into the system is cleaned. Particles in the size of 0.2 - 1 micron are not visible to the eye but are large enough to be seen as they intensify. They can be cleaned with F7 - F9 filters. F class filters are 2nd stage filters and used with a G3 - G4 class pre - filter. The chart is the 1 st left on the left. HEPA filters are used to filter out small particles of 0.2 microns. HEPA filters are 3rd or 4th stage filters. There must be 2 or 3 stage filters in the front.



Hava Filtresi Çeşitleri Nelerdir ve Filtre Seçimi Nasıl Yapılır?
 

Air Filter Classification

Filter Class Name Weight Dust Retention Productivity % Initial Dust Retention
G1 A < 65    
G2 65 < A < 80    
G3 80 < A < 90    
G4 90 < A    
F5   40 < E < 60  
F6   65 < E < 80  
F7   80 < E < 90  
F8   90 < E  
F9      
H10     85 < n
H11     95 < n
H12     99,5 < n
H13     99,95 < n
H14     99,995
U15     99,9995
U16     99,9999
U17     99,9999
* 0.4 Percent Mean Percent Value Accepted
** MPPS (Most Penetrating Particle Size Percentage)

 

Particulate Retention Ratios of Filters to EN 779 Test Standards

Filter Class Name 0.1 Micron Particle Size 0.3 Micron Particle Size 0.5 Micron Particle Size 1 Micron Particle Size 3 Micron Particle Size 5 Micron Particle Size 10 Micron Particle Size
G1         0-5 5-15 40-50
G2       0-5 5-15 15-35 50-70
G3     0-5 5-15 15-35 -35-70 70-85
G4   0-5 5-25 25-45 30-55 60-90 85-98
F5 0-10 5-15 35-50 50-70 70-90 90-99 >98
F6 5-15 10-25 45-65 65-80 85-95 98-99 >99
F7 25-35 45-60 70-85 85-95 >98 >99 >99
F8 35-45 65-75 80-90 95-98 >99 >99 >99
F9 45-60 75-85 90-95 >98 >99 >99 >99
 

Clean Room Standards

Number of Particles Allowed in 1m³

Quality Standard 0,1 µm 0,2 µm 0,3 µm 0,5 µm 1 µm 5 µm
ISO 1 10 2        
ISO 2 100 24 10 4    
ISO 3 1.000 237 102 35 8  
ISO 4 10.000 2.370 1.020 352 83  
ISO 5 100.000 23.700 10.200 3.520 832 29
ISO 6 1.000.000 237.000 102.000 35.200 8.320 293
ISO 7       352.000 83.200 2.930
ISO 8       3.520.000 832.000 29.300
ISO 9       35.200.000 8.320.000 293.000