COMPARISION CHART

ASHRAE 52.2, EN779, ISO 1822 and ISO 16890

ASHRAE Standard 52.2:2012 EN779:2012 ISO16890:2016 ISO1822:2019
Min. Efficiency Reporting Value Composite Average Particle Size Efficiency (Em) % in Size Range, μm Filter Class Average Arrestance (Am) of Synthetic Dust Average Efficiency (Em) at 0.4 µm Minimum Efficiency (Emin) at 0.4 µm Average of initial and discharged efficiency Em=(Ei+Ed)/2 Initial eficiency (Ei) Initial arestance (Am) Initial Efficiency (Ei) at MPPS (typically 0.08-0.15 µm)
Range 1 Range 2 Range 3 Test final dP 250Pa Test final dP 450 Pa ePM1 (%) ePM2.5 (%) ePM10 (%) Coarse (%)
(MERV) 0.3-1.0 1.0-3.0 3.0-10.0 % % % 0.3-1.0 0.3-2.5 0.3-10 ISO Fine Dust %
1(A) Em20 G1 50≤Am≤65 Am<75 Final dP 200 Pa
2(A) Em20 G2 65≤Am≤80
3(A) Em20
4(A) Em20
5(A) Em≥20 G3 80≤Am≤90 Am<75 Final dP 300 Pa
6(A) Em≥35
7(A) Em≥50 G4 Am≤90
8(A) Em≥20 Em≥70
9(A) Em≥35 Em≥75 M5 40≤Em≤60 Ei>50
10(A) Em≥50 Em≥80
11(A) Em≥20 Em≥65 Em≥85 M5 60≤Em≤80 50≤Em≤60 Ei>60
12(A) Em≥35 Em≥80 Em≥90
13(A) Em≥50 Em≥85 Em≥90 F7 80≤Em≤90 Em≥35 50≤Em≤75 Em>70 Ei>80
14(A) Em≥75 Em≥90 Em≥95 F8 90≤Em≤95 Em≥55 75≤Em≤85 Em>80 Ei>90
15(A) Em≥85 Em≥90 Em≥95 F9 95≤Em Em≥70 Em>85
16(A) Em≥95 Em≥95 Em≥95
N/A N/A N/A N/A E10 N/A N/A N/A N/A Ei≥85
E11 Ei≥85
E12 Ei≥99.5
H13 Ei≥99.95
E14 Ei≥99.995
U15 Ei≥99.9995
U16 Ei≥99.99995
U17 Ei≥99.999995
Am – Average Arestance Note: The filter class is the highest class where the filter meets all reuirements. Comparision are approximation given reference only. Filters should be tested to the most recent standards. For ISO ePM1 and ePM2.5 both initial and discharged efficiency need be over 50% to qualify for a class.
Em – Average Efficiency
Emin – Minimum Efficiency
Ed – Discharged Efficiency
Ei – Initial Efficiency
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