Air Quality Class
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0 1 2 3 4 5
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Maximum Number of Solid Particles per m³ for Class 0 and Particle Size 0.10 to 0.5 µ
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As specified by the equipment user or supplier and more stringent than class 1
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Maximum Number of Solid Particles per m³ for Class 1 and Particle Size 0.10 to 0.5 µ
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≤ 20000
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Maximum Number of Solid Particles per m³ for Class 2 and Particle Size 0.10 to 0.5 µ
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≤ 400000
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Maximum Number of Solid Particles per m³ for Class 0 and Particle Size 0.5 to 1.0 µ
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As specified by the equipment user or supplier and more stringent than class 1
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Maximum Number of Solid Particles per m³ for Class 1 and Particle Size 0.5 to 1.0 µ
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≤ 400
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Maximum Number of Solid Particles per m³ for Class 2 and Particle Size 0.5 to 1.0 µ
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≤ 6000
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Maximum Number of Solid Particles per m³ for Class 3 and Particle Size 0.5 to 1.0 µ
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≤ 90000
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Maximum Number of Solid Particles per m³ for Class 0 and Particle Size 1.0 to 5.0 µ
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As specified by the equipment user or supplier and more stringent than class 1
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Maximum Number of Solid Particles per m³ for Class 1 and Particle Size 1.0 to 5.0 µ
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≤ 10
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Maximum Number of Solid Particles per m³ for Class 2 and Particle Size 1.0 to 5.0 µ
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≤ 100
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Maximum Number of Solid Particles per m³ for Class 3 and Particle Size 1.0 to 5.0 µ
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≤ 1000
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Maximum Number of Solid Particles per m³ for Class 4 and Particle Size 1.0 to 5.0 µ
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≤ 10000
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Maximum Number of Solid Particles per m³ for Class 5 and Particle Size 1.0 to 5.0 µ
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≤ 100000
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Water Vapor Pressure Dew Point for Class 0
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As specified by the equipment user or supplier and more stringent than class 1
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Water Vapor Pressure Dew Point for Class 1
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≤ -70 ºC ≤ -94 ºF
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Water Vapor Pressure Dew Point for Class 2
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≤ -40 ºC ≤ -40 ºF
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Water Vapor Pressure Dew Point for Class 3
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≤ -20 ºC ≤ -4 ºF
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Water Vapor Pressure Dew Point for Class 4
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≤ +3 ºC ≤ +37 ºF
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Water Vapor Pressure Dew Point for Class 5
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≤ +7 ºC ≤ +45 ºF
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Total Oil Concentration (Aerosol, Liquid and Vapor) for Class 0
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As specified by the equipment user or supplier and more stringent than class 1
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Total Oil Concentration (Aerosol, Liquid and Vapor) for Class 1
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0.01 mg/m³
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Total Oil Concentration (Aerosol, Liquid and Vapor) for Class 2
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0.1 mg/m³
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Total Oil Concentration (Aerosol, Liquid and Vapor) for Class 3
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1 mg/m³
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Total Oil Concentration (Aerosol, Liquid and Vapor) for Class 4
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5 mg/m³
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Total Oil Concentration (Aerosol, Liquid and Vapor) for Class 0 (Weight/Weight)
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As specified by the equipment user or supplier and more stringent than class 1.
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Total Oil Concentration (Aerosol, Liquid and Vapor) for Class 1 (Weight/Weight)
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0.008 ppm
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Total Oil Concentration (Aerosol, Liquid and Vapor) for Class 2 (Weight/Weight)
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0.08 ppm
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Total Oil Concentration (Aerosol, Liquid and Vapor) for Class 3 (Weight/Weight)
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0.8 ppm
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Total Oil Concentration (Aerosol, Liquid and Vapor) for Class 4 (Weight/Weight)
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4 ppm
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Standard Filtration Delivers ISO Quality Class
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Oil-4 Pressure Dew Point-4 to 5 Solids-3
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Optional Filtration Provides ISO Quality Class
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Oil-1 Pressure Dew Point-4 to 5 Solids-1
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