Air filter selection chart

Filter performance ratings to Australian Standard AS1324.1

Performance Average arrestance Average arrestance

Maximum final
rating Arrestance (Am) Effieciency (Em)
resistance Pa
No. 4 test dust No. 1 test dust

G1 Am < 65 250

G2 65 < = Am < 80 250

G3 80 < = Am < 90 250

G4 90 < = Am 250

40 < = Em < 60 450

F5

F6 60 < = Em < 80 450

F7 80 < = Em < 90 450

F8 450
90 < = Em < 95

F9 95 < = Em 450

Filter types
Type 1: Dry
Type 2: Viscous impingement i.e. Adhesive (gel) coated
Type 3: Metal viscous, MVO or honeycomb grease type
Type 4: Electrostatic precipitators

Filter classes
Class A: Fully disposable, entire filter i.e. Disposable panel filters
Class B: Replaceable media reusable frame i.e. FT3 bag filters etc.
Class C: Reusable frame and media, after cleaning i.e. Washable panels or bag
filters
Class D: Self-renewable i.e. Automatic roll filter etc.

Due to on-going product development, Filterfit reserves the right to change design and specifications without notice

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 Air filter selection chart
Typical particle arrestance efficiency for various grades of filter media
Particulate diameter in microns

1 micron = 1/1000 of a mm
10 micron = 10/1000 of a mm and is the smallest particle able to been seen by the human eye.

Rating 0.1- 0.3 Filter

performance 10 micron 5 micron 1 micron 0.5 micron micron type
G1 90% 60% 20% 0% 0% pre-filter
G2 96% 75% 30% 10% 0% pre-filter
G3 97% 85% 45% 25% 0% pre-filter
G4 98% 92% 58% 35% 5% pre-filter
F5 98% 97% 70% 45% 20% secondary
F6 99% 98% 82% 62% 40% secondary
F7 99.9% 99% 88% 72% 55% secondary
F8 99.9% 99.9% 97% 88% 78% secondary
F9 99.99% 99.99% 98% 95% 93% secondary
H10-H14 100% 100% 100% 100% 99.99% HEPA
U15-U17 100% 100% 100% 100% 99.9975% ULPA
For more information on HEPA or ULPA grades please contact your local distributor

AS1324 test dusts approximate micron sizes

No. I ( methylene blue) - mass median diameter of .65 microns
No.4 5% Cotton fibres
23% Mollocco Black 0.8 micron
72% Air Cleaner fibres 39% 0 to 5 micron
18% 5 to 10 micron
16% 10 to 20 micron
18% 20 to 40 micron
9% 40 to 80 micron

Sizes of particles
Heavy industrial dusts - up to 4000 micron (4mm) Fine road dust - 5 to 20 micron
Dense smoke carbons and cigarette smoke - 0.01 to 1 micron bacteria - 0.8 to 10 microns
Pollens - 5 to 80 micron
Mould spores - 3 to 15 microns
Viruses - 0.01 to 0 .25 microns

Due to on-going product development, Filterfit reserves the right to change design and specifications without notice

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 Particle size table
Substance approximate range of particle diameters (microns)

Rain drops 500 - 5000

Natural mist 60 - 500
Natural fog 2 - 60

Pollens 10 - 100
Ground talc 0.5 - 50
Bacteria 0.3 - 35

Plant spores 10 - 35
Insecticide dusts 0.5 -10

Stoker fly ash 10 - 8000

Pulverized coal, fly ash 1 - 50
Foundry dusts 1 - 1000

Cement dust 3 - 100

Metallurgical dust 0.5 - 100
Dust damaging to lungs 0.5 - 5

Oil smoke 0.1 - 1.0

Resin smoke 0.01 - 1.0
Tobacco smoke 0.01 - 1.0

Carbon black 0.01 - 0.3

Pigments (paints) 0.1 - 5

Viruses 0.003 - 0.05

Human hair 35 - 200

Conversion factors
Length Area
1 inch = 25.4 mm = 2.54 centimeters 1 square metre = 10.76 square feet
1 metre = 100 centimetres = 3.28 ft 1 square foot = 0.0929 square meters
1 ft = 305 mm = 30.5 centimetres
1 ft = 12 Inches

Imperial - Metric Metric - Imperial

Inches x 25.4 = mm mm x 0.0394 = inches

Feet x 0.3048 = Metres/feet/min x 0.005 = Meters x 3.2808 = feet meters/sec x 197 =

Metres/sec feet/min

Square feet x 0.0929 = square metres Square meters x 10.764 = square

Cubic feet/min x 0.472 = Litres/sec Litres/sec x 2.1186 = cubic feet/min

Inches water gauge x 249.089 = Pascals Pascals x 0.004 = inches water

gauge

CFM x 0.472 = litres per second m3 hr x 0.588 = CFM

Due to on-going product development, Filterfit reserves the right to change design and specifications without notice

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