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2013.09.08
New BAISHENG website is now available
To provide more information to foreigner customers, English version pages is now available.
 
2013.08.10
The goods delivered to Taoyuan Airport , have passed the efficiency test.
 
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ASHRAE
ASHRAE 52.1
The Standard 52.1-1992 is the old US - standard for performance testing of HVAC air filters. This standard is however still sometimes quoted and provides three evaluation criteria:

•dust spot efficiency
• arrestance
• dust holding capacity
 
ASHRAE 52.2

The 52.1 standard is "replaced" by standard 52.2-1999, that provides more realistic data on filter performance. It provides filter's initial efficiency as a function of particle size, as well as a numeric value that allows a user or engineer to specify a product's minimum efficiency reporting value (MERV).

Read the Camfil overview, which fully explains the standards and how to use them.

EN 779 : 2012
Classification of air filters1)
Group Class Final pressure drop (test) Pa Average arrestance (Am) of synthetic dust % Average efficiency (Em) for 0.4 μm particles % Minimum efficiency2) 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
1 The characteristics of atmospheric dust vary widely in comparison with those of the synthetic loading dust used in the tests. Because of this, the test results do not provide a basis for predicting either operational performance or service life. Loss of media charge or shedding of particles or fibres can also adversely affect efficiency.
2 Minimum efficiency is the lowest of any of the following three values: initial efficiency, discharged efficiency or efficiency throughout the test's loading procedure.