PARTICLE SIZE CHART - Colorado Correctional Industries

PARTICLE SIZE CHART

Filters are designed to take out contaminants from the air. There are thousands of different types of these contaminants that effect our lives every day and this chart gives a variety of particle sizes to compare with. From a FIBERGLASS FILTER that takes out the larger particles to the H.E.P.A. FILTER that takes out the very fine particles, a filter is important in helping keep the air clean.

NOT VISIBLE TO THE EYE

VISIBLE TO THE EYE

Rain Drops

Sand Tailings

Mist

Ground Limestone

Pollens

Flour Mill Dust

Foundry Dust

Asphalt Paving

Insecticide Dust

Sea Fog

Spray Dried Milk

Cement Dust

Soot Blowing - Boiler Tubes

Bacteria

Fertilizer Plant Dust & Fumes

Smelter Dust & Fumes

Sulfuric Acid Mist & Fumes Paint Pigments Coal Smoke

Pulverized Fuel Fly Ash

Atmospheric Dust

Resin Smoke

Tobacco Smoke

Carbon Black

0.001

0.05

0.01

0.05

0.1

0.5

1

5

10

50

PARTICLE SIZE - MICRONS

500

1,000

MERV RATING CHART

5000

Standard 52.5 Minimum

Efficiency Reporting Value

Dust Spot Efficiency

20

n/a

19

n/a

10

n/a

17

n/a

16

n/a

15

>95%

14

90-95%

Arrestance

Typical Controlled Contaminant

n/a < 0.30 pm particle size

n/a Virus (unattached)

n/a Carbon Dust :

n/a All Combustion smoke

n/a

.30-1.0 pm Particle Size

n/a

All Bacteria

>98%

Most Tobacco Smoke

13

89-90%

>93%

Proplet Nuclei (Sneeze)

12

70-75%

>95%

1.0-3.0 pm Particle Size

? Legionella

11

60-65%

>95%

Humidifier Dust

Lead Dust

10

50-55%

>95%

Milled Flour

Auto Emissions

9

40.%

>90%

Welding Fumes

8

30-35%

>90%

3.0-10.0 pm Particular Size

Mold Spores

7

25-30%

>90%

Hair Spray

Fabric Protector.

6

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