569 / 920
Particulate Air Cleaning
ASHRAE 52.2 MERV Ratings
Range 1
(0.3 – 1.0)
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
E1<75
75<E1<85
85<E1<95
95<E1
Range 2
(1.0 – 3.0)
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
E2<50
50<E2<65
65<E2<80
80<E2
90<E2
90<E2
90<E2
95<E2
Range 3
(3.0 – 10.0)
E3<20
E3<20
E3<20
E3<20
20<E3<35
35<E3<50
50<E3<70
70<E3
85<E3
85<E3
85<E3
90<E3
90<E3
90<E3
90<E3
95<E3
Dust Spot
Efficiency
<20%
<20%
<20%
<20%
<20%
<20%
25-30%
30-35%
40-45%
50-55%
60-65%
70-75%
80-90%
90-95%
>95%
n/a
Arrestance
<65%
65-70%
70-75%
75-80%
80-85%
85-90%
>90%
>90%
>90%
>95%
>95%
>95%
>98%
>98%
n/a
n/a
Composite average particle size efficiency,
% in size range, µm
Source: National Air Filtration Association and
ANSI/ASHRAE Standard 52.2
Approx. Std. 52.1 Results
Standard 52.2
Minimum Efficiency
Reporting Value
(MERV)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16