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ISO 16890

ISO16890: Overview of Classification System
Group Designation	Requirement			Class reporting value
	ePM1, min	ePM2.5, min	ePM10
ISO Coarse	~	~	<50%	Initial gravimetric arrestance
ISO ePM10	~	~	>/=50%	ePM10
ISO ePM2.5	~	>/=50%	~	ePM2.5
ISO ePM1	>/=50%	~	~	ePM1

ISO16890: Classification Table
PM	PM1 Classification	PM2.5 Classification	PM10 Classification	Coarse
	ePM1 95%	ePM2.5 95%	ePM10 95%	Arrestance reported in 5%
	ePM1 90%	ePM2.5 90%	ePM10 90%
	ePM1 85%	ePM2.5 85%	ePM10 85%
	ePM1 80%	ePM2.5 80%	ePM10 80%
	ePM1 75%	ePM2.5 75%	ePM10 75%
	ePM1 70%	ePM2.5 70%	ePM10 70%
	ePM1 65%	ePM2.5 65%	ePM10 65%
	ePM1 60%	ePM2.5 60%	ePM10 60%
	ePM1 55%	ePM2.5 55%	ePM10 55%
	ePM1 50%	ePM2.5 50%	ePM10 50%
Particle Size	0.3-1 Micron	0.3-3 Micron	0.3-10 Micron
Requirement	>50% initial efficiency	>50% initial efficiency	>50% initial efficiency	No discharge requirement
Requirement	>50% discharged efficiency	>50% discharged efficiency	No discharge requirement

EN 779

The table shows the various classifications of per EN 779:2012

Group	Filter Class	Final pressure drop (test) Pa	Average arrestance (Am) of synthetic dust %	Average efficiency (Em) for 0.4 µm particles %	Minimum efficiency (1) for 0.4 µm particles %
Coarse	G1	250	50 ≤ Am < 65	~	~
	G2	250	65 ≤ Am < 80	~	~
	G3	250	80 ≤ Am < 90	~	~
	G4	250	90 ≤ Am	~	~
Medium	M5	450	~	40 ≤ Em < 60	~
	M6	450	~	60 ≤ Em < 80	~
Fine	F7	450	~	80 ≤ Em < 90	35
	F8	450	~	90 ≤ Em < 95	55
	F9	450	~	95 ≤ Em	70
Note: Minimum efficiency is the lowest of any of the following three values: initial efficiency, discharged efficiency or efficiency throughout the test’s loading procedure."

ASHRAE 52.2

Range	Group	Size (µm)
1	E1	0.30 to 0.40
2		0.40 to 0.55
3		0.55 to 0.70
4		0.70 to 1.00
5	E2	1.00 to 1.30
6		1.30 to 1.60
7		1.60 to 2.20
8		2.20 to 3.00
9	E3	3.00 to 4.00
10		4.00 to 5.50
11		5.50 to 7.00
12		7.00 to 10.00

Minimum Efficiency Reporting Value (MERV) Parameters Table

Standard 52.2 Minimum Effeciency Reporting Value ( MERV )	Composite Average Particle Size Efficiency, % in Size Range, μm			Average Arrestance, %
Standard 52.2 Minimum Effeciency Reporting Value ( MERV )	Range 1 0.30-1.0	Range 2 1.0-3.0	Range 3 3.0-10.0	Average Arrestance, %
1	N/A	N/A	E3 < 20	Aavg < 65
2	N/A	N/A	E3 < 20	65 ≤ Aavg
3	N/A	N/A	E3 < 20	70 ≤ Aavg
4	N/A	N/A	E3 < 20	75 ≤ Aavg
5	N/A	N/A	20 ≤ E3	N/A
6	N/A	N/A	35 ≤ E3	N/A
7	N/A	N/A	50 ≤ E3	N/A
8	N/A	20 ≤ E2	70 ≤ E3	N/A
9	N/A	35 ≤ E2	75 ≤ E3	N/A
10	N/A	50 ≤ E2	80 ≤ E3	N/A
11	20 ≤ E1	65 ≤ E2	85 ≤ E3	N/A
12	35 ≤ E1	80 ≤ E2	90 ≤ E3	N/A
13	50 ≤ E1	85 ≤ E2	90 ≤ E3	N/A
14	75 ≤ E1	90 ≤ E2	95 ≤ E3	N/A
15	85 ≤ E1	90 ≤ E2	95 ≤ E3	N/A
16	95 ≤ E1	95 ≤ E2	95 ≤ E3	N/A

EN 1822 (2019)- HEPA Filter Test Standard

According to this standard, filter elements fall into one of the following Groups:
— EPA filters (Efficient Particulate Air filter);
— HEPA filters (High Efficiency Particulate Air filter);
— ULPA filters (Ultra Low Penetration Air filter).

The table shows the various classifications of EPA, HEPA & UPLA filters per EN 1822:2019

Table — Classification of EPA, HEPA and ULPA filters
Group	Filter Class	Integral value		Local value
Group	Filter Class	Efficiency (%)	Penetration (%)	Efficiency (%)	Penetration (%)
EPA	E10	≥ 85	≤ 15	–-c	–-c
	E11	≥ 95	≤ 5	–-c	–-c
	E12	≥ 99,5	≤ 0,5	–-c	–-c
HEPA	H13	≥ 99,95	≤ 0,05	≥ 99,75	≤ 0,25
HEPA	H14	≥ 99,995	≤ 0,005	≥ 99,975	≤ 0,025
UPLA	U15	≥ 99,9995	≤ 0,0005	≥ 99,9975	≤ 0,002 5
	U16	≥ 99,999 95	≤ 0,00005	≥ 99,99975	≤ 0,000 25
	U17	≥ 99,999 995	≤ 0,000005	≥ 99,999 9	≤ 0,000 1

Cleanroom Standards

ISO 14644-1:This is a non-governmental standard developed by the International Organization for standardization (ISO). This standard applies to clean rooms in general (see table below);

Class	Maximum particles/m3 a						FED STD 209E Equivalent
Class	≥0.1 μm	≥0.2 μm	≥0.3 μm	≥0.5 μm	≥1 μm	≥5 μm	FED STD 209E Equivalent
ISO 1	10b	d	d	d	d	e
ISO 2	100	24b	10b	d	d	e
ISO 3	1,000	237	102	35b	d	e	Class 1
ISO 4	10,000	2,370	1,020	352	83b	e	Class 10
ISO 5	1,00,000	23,700	10,200	3,520	832	d,e,f	Class 100
ISO 6	10,00,000	2,37,000	1,02,000	35,200	8,320	293	Class 1,000
ISO 7	c	c	c	3,52,000	83,200	2,930	Class 10,000
ISO 8	c	c	c	35,20,000	8,32,000	29,300	Class 100,000
ISO 9	c	c	c	3,52,00,000	83,20,000	2,93,000	Room air
a All concentrations in the table are cumulative, e.g., for ISO Class 5, the 10 200 particles shown at 0,3 μm include all particles equal to and greater than this size. b These concentrations will lead to large air sample volumes for classification. Sequential sampling procedure may be applied; see Annex D. c Concentration limits are not applicable in this region of the table due to very high particle concentration. d Sampling and statistical limitations for particles in low concentrations make classification inappropriate. e Sample collection limitations for both particles in low concentrations and sizes greater than 1 μm make classification at this particle size inappropriate, due to potential particle losses in the sampling system. f In order to specify this particle size in association with ISO Class 5, the macroparticle descriptor M may be adapted and used in conjunction with at least one other particle size. (See C.7.) Table above provides a comparison of classifications between ISO14644-1 and FS209E. Because 1m3 is approximately 35ft3, the two standards are mostly equivalent when measuring 0.5μm particles, although the testing standards differ. Ordinary room air is approximately ISO Class9, or Class 1,000,000.

US FED STD 209E

US FED-STD-209E was a United States federal standard. It was officially cancelled by the General Services Administration on November 29, 2001, but is still widely used.

Class	Maximum particles/ft3					ISO equivalent
Class	≥0.1 μm	≥0.2 μm	≥0.3 μm	≥0.5 μm	≥5 μm	ISO equivalent
1	35	7.5	3	1	0.007	ISO 3
10	350	75	30	10	0.07	ISO 4
100	3,500	750	300	100	0.7	ISO 5
1,000	35,000	7,500	3000	1,000	7	ISO 6
10,000	3,50,000	75,000	30,000	10,000	70	ISO 7
1,00,000	3.5×106	7,50,000	3,00,000	1,00,000	830	ISO 8

EU GMP classification

EU GMP guidelines are more stringent than others, requiring cleanrooms to meet particle counts at operation (during manufacturing process) and at rest (when manufacturing process is not carried out, but room AHU is on).

Class	Maximum particles/m3
	At Rest		In Operation
	0.5 μm	5 μm	0.5 μm	5 μm
Grade A	3,520	20	3,520	20
Grade B	3,520	29	3,52,000	2,900
Grade C	3,52,000	2,900	35,20,000	29,000
Grade D	35,20,000	29,000	Not defined	Not defined

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