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AIR CHANGES PER HOUR CALCULATOR

Enter your room average velocity and room dimensions then click the CALCULATE button:

Average Room Velocity (see chart below):

fpm

Room length:

feet

Room Width:

feet

Room Height:

feet

Results:

Air Changes per hour:

Room CFM:

 
 

SUGGESTED ROOM AIR CHANGE RATES

FS209E

Room Air Changes per Hour

Room

 Avg Room Velocity

 HEPA Filter Ceiling Coverage

(based on 8'- 0" ceiling)

Classification

Recommended

Range

Rec'md

Range

Rec'md

Range

1

90

75-100

100%

100%-100%

675

563-825

10

90

75-100

100%

100%-100%

675

563-750

100

90

75-96

100%

100%-100%

675

53-750

1000

45

25-48

50%

28%-53%

338

188-360

10000

12

8-16

15%

9-18%

90

60-120

100000

5

4-8

6%

4%-9%

38

30-60

 

Notes:

1.0 There are NO industry standards that dictate air change rates, ACPH is a dependent variable.  The cleanroom contractor selected should have experience in the design and commissioning of these rooms such that the average velocity and room architectural configuration will lead to the desired level of particle control, in the state (e.g., as-built, at-rest, or operational) as defined by the cleanroom design/construction contract. 
ACPH = (Avg. room velocity x 60)/(room height), Room CFM = (ACPH x Room volume)/60

2.0   Air velocities for cleaner classes of cleanrooms tend to fall in the lower end of the recommended range while velocities for less clean classes tend to exceed the upper end of the range, but neither should normally fall below  the lower end of the range. Ranges shown are those typically used.  For 100% HEPA filter ceilings an average active filter face velocity of 100 fpm will normally provide an average room velocity of 80-90 fpm.  For Class 1000 and less clean classes, it is always preferable to provide MORE filters, and to run them at lower velocities.

3.0 Parameters shown are valid for a standard cleanroom with ceiling height not-to-exceed 10 feet.  Cleanrooms with greater than 10 feet internal height - such as those for high bay aerospace applications -  must be examined on an individual basis.

4.0 Class 10 requires 99.999 on 0.12 micron or better ULPA filters
 

5.0 Class 1 requires 99.9995 on 0.12 micron or better VLSI filters

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