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
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
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 |
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 |