FILTERS FOR VENTILATIONS
Filters for use in ventilation, air conditioning and ventilation systems appear around us more often.
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:
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).