Comparison of Filter Standards

ASHRAE Standard 52.2-1999 ASHRAE 52.1 EN EN779:2012 EN 1822 Minimum Eff Reporting Value Composite Average Particle Size Efficiency % in Size Range, μm Average Arrestance Average Dust Spot Efficiency Filter… Read more
ASHRAE Standard 52.2-1999 ASHRAE 52.1 EN EN779:2012 EN 1822

Minimum Eff Reporting Value

Composite Average Particle Size Efficiency % in Size Range, μm

Average Arrestance

Average Dust Spot Efficiency

Filter Class

Av. Arrestance of Syn. Dust

Av. Eff at 0.4 μm

Min Eff. at 0.4 μm

Average Eff at MPPS μm
  Range 1 Range 2 Range 3

NB. This standard is obsolete and here for reference only. Performances are not equivalent to ASHREA 52:2 or EN779.

   Test Final DP 250Pa Test Final Dp 450Pa  
( MERV ) 0.30 – 1.0 1.0 – 3.0 3.0 – 10.0 % %   % % % %
1 n/a n/a E3<20 Aavg<65 <20 G1 50≤Am≤65      
2 n/a n/a E3<20 Aavg<65 <20 G2 65≤Am≤80      
3 n/a n/a E3<20 Aavg<70 <20  
4 n/a n/a E3<20 Aavg<75 <20  
5 n/a n/a E3≥20 80 20 G3 80≤Am≤90      
6 n/a n/a E3≥35 85 20-25  
7 n/a n/a E3≥50 90 25-30 G4 90Am≤      
8 n/a n/a E3≥70 92 30-35  
9 n/a n/a E3≥85 95 40-45 M5   40≤Em≤60    
10 n/a E2≥50 E3≥85 92 50-55  
11 n/a E2≥65 E3≥85 97 60-65 M6   60≤Em≤80    
12 n/a E2≥80 E3≥90 98 70-75  
13 n/a E2≥90 E2≥90 98 80-85 F7    80≤Em≤90 35  
14 n/a E2≥90 E2≥90 99 90-95 F8    90≤Em≤95 55  
15 n/a E2≥90 E2≥90 99 95 F9    95≤Em 70  
16 n/a E2≥95 E2≥95 100 99 E10       <85
N/A N/A N/A N/A N/A N/A E11       <95
E12       <99.5
H13       <99.95
H14       <99.995
U15       <99.9995
U16       <99.99995
U17       <99.999995

Note: The final MERV value is the highest MERV where the filter data meets all requirements of that MERV.