Comparison of Filter Standards

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
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 This standard is obsolete and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.