Table 4 Minimum efficiency reporting values and filter efficiencies by particle size in ASHRAE Standard 52.2-2017

1

n/a

n/a

E₃ < 20

2

n/a

n/a

E₃ < 20

3

n/a

n/a

E₃ < 20

4

n/a

n/a

E₃ < 20

5

n/a

n/a

20 ≤ E₃

6

n/a

n/a

35 ≤ E₃

7

n/a

n/a

50 ≤ E₃

8

n/a

20 ≤ E₂

70 ≤ E₃

9

n/a

35 ≤ E₂

75 ≤ E₃

10

n/a

50 ≤ E₂

80 ≤ E₃

11

20 ≤ E₁

65 ≤ E₂

85 ≤ E₃

12

35 ≤ E₁

80 ≤ E₂

90 ≤ E₃

13

50 ≤ E₁

85 ≤ E₂

90 ≤ E₃

14

75 ≤ E₁

90 ≤ E₂

95 ≤ E₃

15

85 ≤ E₁

90 ≤ E₂

95 ≤ E₃

16

95 ≤ E₁

95 ≤ E₂

95 ≤ E₃