Filters for use in ventilation, air conditioning and ventilation systems appear around us more often.

Ventilation filters are classified according to the standard ISO 16890.

The designation of filters due to the quality of filtration, for example, looks like “G4” and consists of a letter and a digit.

The code describing the quality of the filter material contains:

• insignificant (do to tests) letter G (ground), M (medium),F (fine), E (effcient), H (high), U (ultra), informing the customer only about the approximate quality of the filter
• significant digit from 1 to 17, classifying the filter in terms of the actual quality of filtration.

 

ISO16890 norm and polish replacement coded PN/EN 1822 (and obsolete PN/EN 779 norm) use a very descriptive https://viagrageneriquefr24.com and unfortunately not very specific classification model. A customer interested in purchasing filters in higher quality classes should always request used detailed research methods.

Now, polish regulations require testing 100% of filters against the so-called “leak” for filters up from H13. On this occasion, a test certificate is issued for each filter (obligatory).

Group of filters	Class	End resistance of air	Avarage capturing(Am), sintetic dust(%)	Avarage efficiency(Em) for  0.4 μm particles (%)	Minimum efficiency(ME)1) for 0.4 μm particles (%)
Ground filters	G1	250 Pa	50 ≤ Am < 65	–	–
	G2		65 ≤ Am < 80	–	–
	G3		80 ≤ Am < 90	–	–
	G4		90 ≤ Am	–	–
Medium filters	M5	450 Pa	–	40 ≤ Em < 60	–
	M6		–	60 ≤ Em < 80	–
Fine filters	F7	450 Pa	–	80 ≤ Em < 90	35
	F8		–	90 ≤ Em < 95	55
	F9		–	95 ≤ Em	70

 

 

 

Group of filters	Class	Total efficiency (%)	Total leakage (%)	Local efficiency (%) 1)2)	Local leakage (%) 1)2)
E Group EPA	E10	≥ 85	≤ 15	– 3)	– 3)
	E11	≥ 95	≤ 5	– 3)	– 3)
	E12	≥ 99,5	≤ 0,5	– 3)	– 3)
H Group HEPA	H13	≥ 99,95	≤ 0,05	≥ 99,75	≤ 0,25
	H14	≥ 99,995	≤ 0,005	≥ 99,975	≤ 0,025
U Group ULPA	U15	≥ 99,999 5	≤ 0,000 5	≥ 99,997 5	≤ 0,002 5
	U16	≥ 99,999 95	≤ 0,000 05	≥ 99,999 75	≤ 0,000 25
	U17	≥ 99,999 995	≤ 0,000 005	99,999 9	≤ 0,000 1

 

 

 

 

 

 

 

 

 

1) see: 7.5.2 PN EN 1822-4

2) local values lower than those specified in the table may be agreed between the supplier and the buyer

3) E group filters can not and should not be tested for leak (for classification purposes).