Frequently Asked Question - Cleanroom Section

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      Cleanroom Industry Thumb Rule for Constructing Cleanrooms

ISO Class	Controls	Air Velocity at table level in FPM	Air Changes Rate per Hour	HEPA Coverage as % of Ceiling
1	Stringent	70 - 130	>750	100
2	Stringent	70 - 130	>750	100
3	Stringent	70 - 130	>750	100
4	Stringent	70 - 110	500 - 600	100
5	Stringent	70 - 90	150 - 400	100
6	Intermediate	25 - 40	60 - 100	33 - 40
7	Intermediate	10 - 15	25 - 40	10 - 15
8	Less Stringent	3 - 5	10 - 15	05 -10