IP1: Dust
particles, their sizes and appropriate filter grades
The standard method of testing to evaluate performance of air filters in general ventilation and air conditioning is BS6540 (EN779:1993, European Standard). The test consists of two parts:
A: The synthetic dust weight arrestance test - providing an arrestance value when the filter is fed with a blended synthetic dust.
B: The atmospheric
dust spot efficiency test
- giving an efficiency
value produced using an atmospheric staining technique.
The following values
are obtained
Initial efficiency - The efficiency of
the filter against carbonaceous staining
contamination in its clean state.
Initial arrestance - the effectiveness of the
filter against large
particulate matter in its clean
state. Both efficiency and arrestance have
average values which represent performance at the average condition of
the filter through its
life.
This chart has been reproduced with permission from publication NFC4 produced by the Nationwide Filter Company Ltd. 5 Rufus Business Centre, Ravensbury Terrace, London, SW18 4RL. Tel +44(0) 20 8944 8877.
