Air Flow & Ceiling Filter

Air Flow Rates

For detailed information on Air Flow Velocity Rates, contact a our specialists to get specific answers to your project.

Class per ISO 14644 (Old FS 209 e)	Average Airflow (Across Entire Room)	Air Changes (per hour)
ISO 8 (Class 100,000)	0.005 – 0.041 m/sec (1 – 8 ft/min)	5 – 48
ISO 7 (Class 10,000)	0.051 – 0.076 m/sec (10 – 15 ft/min)	60 – 90
ISO 6 (Class 1,000)	0.127 – 0.203 m/sec (25 – 40 ft/min)	150 – 240
ISO 5 (Class 100)	0.203 – 0.406 m/sec (40 – 80 ft/min)	240 – 480
ISO 4 (Class 10)	0.254 – 0.457 m/sec (50 – 90 ft/min)	300 – 540
ISO 3 (Class 1)	0.305 – 0.457 m/sec (60 – 90 ft/min)	360 – 540
ISO 2 and cleaner	0.305 – 0.508 m/sec (60 – 100 ft/min)	360 – 600
Note: Actual average velocity and air changes required may vary depending on the application, floor plan and number of personnel. Typical face velocity from the filter is 90 feet per minute. Average airflow is determined by airflow readings from several interior points.

Ceiling Filter Coverage

Finding the correct ceiling filter coverage is essential to maintaining your controlled environment. Below is an outline of filter coverage for reference. For detailed information, contact a our specialists to get specific answers to your project.

Class – ISO 14644 (per Fed. Stnd 209e)	Ceiling Coverage
ISO 8 (Class 100,000)	5 – 15%
ISO 7 (Class 10,000)	15 – 20%
ISO 6 (Class 1,000)	25 – 40%
ISO 5 (Class 100)	50 – 100%
ISO 4 (Class 10)	100% *
ISO 3 (Class 1)	100% *
ISO 2 and cleaner	100%*
*ULPA filters required in Class 10 – 1 and cleaner applications. HEPA filters used in all others.

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