Industry new

Air filter classification standards

Why do air filters mainly have primary air filters, medium air filters and high efficiency air filters? The reason is also very simple. Air filters are graded according to their filtration efficiency.

The classification of air filters was born: With the development of the Microelectronics industry, the requirements for air filters, especially efficient filters, have become stricter. The German standard DIN24183 has taken the lead in proposing &; Quot; Easiest to penetrate particle size & amp; Quot; (MPS) method, and the most easily penetrated particle size to detect the efficiency of air filters. In fact, different filter materials and different filter speeds are the most easily penetrated particle size is different, It is generally in the range of 0.11um-0.25um. Then the efficiency is tested with this particle size or used for scanning experiments.

MPPS is the most strict test standard at present. DOP is generally used for specific tests. DOP(o-dimethyldioctyl Ester) method: The experimental dust source is 0.3 um single dispersed phase DOP droplets, and the measurement dust instrument is a photometer, The filter efficiency of DOP particles is determined by the turbidity difference of the gas sample. At present, a large flow laser particle counter or condensation core counter is gradually used to scan the entire air surface of the filter.

The classification standards for each air filter are as follows:

Chinese Standard	European standards EN779-1993	American DOP Act 0.3 um efficiency / %	ASHRA standard Weight method efficiency/%	ASHRAE standard colorimetric efficiency/%
Crude filter	G1		< 65
Crude filter	G2		65-80
Crude filter	G3		80-90
Medium filter	G4		>=90
Medium filter	F5			40-60
High school efficiency filter	F6	20-25		60-80
High school efficiency filter	F7	55-60		80-90
High school efficiency filter	F8	65-70		90-95
High school efficiency filter	F9	75-80		>=95
Sub-efficient filter	H10	> 85
Sub-efficient filter	H11	> 98
Efficient Filter A	H12	> 99.9
Efficient Filter A	H13	> 99.97
Efficient Filter B	H14	> 99.997
Efficient FilterC	U15	> 99.9997
Efficient FilterD	U16	> 99.99997
Efficient FilterD	U17	> 99.999997

Classification Standard for Atmospheric Dust Counting Method

GB12218-89classification	Ⅰ	Ⅱ	Ⅲ	Ⅳ	Ⅴ
particle size（μm）	≥5.0		≥1.0		≥0.5
Counting efficiency（%）	<40	40≤E＜80	40≤E＜80	70≤E＜99	95≤E＜99.9
GB/T14295-93classification		Crude effect	Medium	High school	Sub-efficient
particle size(μm）		≥5.0	≥1.0		≥0.5
Counting efficiency（%）		20≤E＜80	20≤E＜70	70≤E＜99	95≤E＜99.9

European Filter Classification Standard

standard	EN779:1993		EN1882-1:1998
specifications	Weight method(%) Arrestance	A colorimetric or counting method.(%) Dust-spot Or Particle Efficiency	Most easily penetrated particle size method(%) MPPS
G1 G2 G3 G4	E<65 65≤E<80 80≤E<90 90≤E
F5 F6 F7 F8 F9		40≤E<60 60≤E<80 80≤E<90 90≤E<95 95≤E
H10 H11 H12 H13 H14			85≤E＜95 95≤E＜99.5 99.5≤E＜99.95 99.95≤E＜99.995 99.995≤E＜99.9995
U15 U16 U17			99.9995≤E＜99.99995 99.99995≤E＜99.999995 99.999995≤E

American Air Filter Classification Standard

specifications	Counting method(%)Particle Efficiency			Weight counting(%) Arrestance	test Final resistance(Pa) Final Resist
specifications	0.3～1.0μm	1.0～3.0μm	3.0～10.0μm	Weight counting(%) Arrestance	test Final resistance(Pa) Final Resist
MERV1 MERV2 MERV3 MERV4			E3<20 E3<20 E3<20 E3<20	Aavg＜65 65≤Aavg＜70 70≤Aavg＜75 70≤Aavg	75 75 75 75	E1 is the lowest average of the entire process of the four particle size intervals of 0.30-0 .40, 0.40-0 .55, 0.55-0 .70, 0.70-1 .0 μm; E2 is the lowest average of the four particle size ranges of 1.0-1 .3, 1.3-1 .6, 1.6-2 .2, 2.2-3 .0 μm; E3 is the lowest average of the four particle size ranges 4.0-4.0, 4.0-5.5, 5.5-7.0, 7.0-10.0 μm
MERV5 MERV6 MERV7 MERV8			20≤E3＜35 35≤E3＜50 50≤E3＜70 70≤E3＜80		150 150 150 150
MERV9 MERV10 MERV11 MERV12		E2＜50 50≤E2＜65 65≤E2＜80 80≤E2＜90	85≤E3 85≤E3 85≤E3 90≤E3		250 250 250 250
MERV13 MERV14 MERV15 MERV16	E1＜75 75≤E1＜75 85≤E1＜95 95≤E1	90≤E2 90≤E2 90≤E2 95≤E2	90≤E3 90≤E3 90≤E3 95≤E3		350 350 350 350
MERV17 MERV18 MERV19	≥99.97% IEST-A類對0.3 μm 粒子 ≥99.99% IEST-C類 HEPA過濾器 ≥99.999% IEST-D類
MERV20	對0.1~0.2μm 粒子, 掃描法≥99.999% IEST-F類 UEPA過濾器