What are the classifications of clean rooms?

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Generally clean rooms are classified in to the following types as per different guidelines:
** Schedule M: Grade A, Grade B, Grade C, Grade D
** USFDA (US 209E): Class 1, Class 10, Class 100, Class 1000, Class 10000, Class 100,000
** WHO 2002: Grade A, Grade B, Grade C, Grade D
** EU GMP: Grade A, Grade B, Grade C, Grade D
** ISO 14644-1: ISO-3, ISO-4, ISO-5, ISO-6, ISO-7, ISO-8, ISO-9
** Australia (AS 1386): 0.035, 0.35, 3.5, 35, 350, 3500
** Germany (VDI 2083): 1, 2, 3, 4, 5, 6

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