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What classification do I need?

It depends on your industry. The requirements will vary depending upon what size particles need to be filtered, the sources of contamination present, and recommended air change rate. If your industry is government regulated, you can check applicable regulation to see what classification is required. If there is no government-mandated or industry default classification, you’ll need to determine the appropriate classification, based on your application.

US FED STD 209E

Class Maximum  Particles/ft³ ISO equivalent
>0.1 um >0.2 um >0.3 um >0.5 um >5 um
 1 35 7 3 1 ISO3
 10 350 75 30 10 ISO4
100 100 ISO5
1000 1000 7 ISO6
10,000 10,000 70 ISO7
100,000 100,000 700 ISO8

ISO 14644-1 Cleanroom Standards

Class Maximum  Particles/m³ FED STD 209E equivalent
>0.1 um >0.2 um >0.3 um >0.5 um >1 um >5 um
ISO 1 10 2
ISO 2 100 24 10 4
ISO 3 1,000 237 102 35 8 Class1
ISO 4 10,000 2,370 1,020 352 83 Class10
ISO 5 100,000 23,7000 102,000 3,520 8,320  293 Class 100
ISO 6 1,000,000 237,000 102,000 35,200 8,320 2,930 Class1,000
ISO 7 352,000 83,200 2,930 Class 10,000
ISO 8 3,520,000 832,000 29,300 Class 100,000
ISO 9 35,200,000 8,320,000 293,000 Room Air
Criteria Class 10 ISO4 Class 100 ISO5 Class 1000 ISO6 Class 10,000 ISO7 Class 100,000 ISO8
Air changes per HR/Min 500-600 / 8 to 10 300 to 480 / 5 to 8 180 / 3 60 /1 20 /0.33
Filter coverage % 90 – 100 60 – 70 20 – 30 7 – 15 4  – 5
CFM per square foot 85 – 90 36 – 65 18 – 32 9 – 16 4 – 8
Filter Efficiency 99.9997% ULPAs 99.997% HEPAs 99.997% HEPAs 99.997% HEPAs 99.97% HEPAs
Ceiling Type Aluminum T-bar grid Aluminum T-bar grid Aluminum T-bar grid Conventional T-bar grid Conventional T-bar grid
Light Fixture type Tear drop or Flow thru Tear drop or 2’x4’ cleanroom fixture 2’x4’ cleanroom fixture 2’x4’ cleanroom fixture 2’x4’ standard fixture
Ceiling Panel FRP, Vinyl rock or Mylar FRP, Vinyl rock or Mylar Vinyl rock or Mylar Vinyl rock or Mylar Vinyl rock or Mylar
Wall System Modular or standard built Modular or standard built Modular or standard built Modular or drywall Modular or drywall
Flooring cover Welded sheet vinyl or Epoxy Welded sheet vinyl or Epoxy Welded Sheet vinyl or Epoxy Sheet vinyl or VCT Sheet vinyl or VCT
Flooring base 2” to 6” cove Cove or Aluminum base channel Cove or Aluminum base channel Cove or Aluminum base channel Cove or Aluminum base channel
Air Returns Raised floor or center returns Low wall on long axis Low wall at perimeter Low wall Low wall or ceiling
Asked on February 14, 2019 in Cleanroom Classifications.
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