British Standard 5295
Class 1: The particle counts shall not exceed a total of 3000 particles/m3 of a size of 0.5μ (micron) or greater. The greatest particle present in any sample shall not exceed 5μ (micron).
Class 2: The particle count shall not exceed a total of 300,000 particles/ m3 of a size 0.5μ (micron) or greater: 2000 particles/m3 of a size 5μ (micron) or greater: 30 particles of a size 10μ (micron) or greater.
Class 3: The particle count shall not exceed 1,000,000 particles of a size of 1 micron or greater: 20,000 particles/m3 of a size 5μ (micron) or greater: 4000 particles/m3 of a size 10μ (micron) or greater; 300 particles/m3 of a size 25μ (micron) or greater.
Class 4: The particle count shall not exceed a total of 200,000 particles/m3 of a size 5μ (micron) or greater: 40,000 particles/m3 of a size 10μ (micron) or greater: 4000 particles/m3 of a size 25μ (micron) or greater. (3000 particles/m3 at 0.5um converts to about 85 particles/Ft3)
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