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                                            Airflow Conversion Table


As you read through the magazines or your personal data on the flow rates of heads and intakes,
you'll find that shops don't always stick with a standard measurement on flow data. The industry
standard is 28" of water, but it's not always the information you get.  Use the chart below to
obtain the correct figures so all your data can be compared on a level basis.  


For example:  You have head flow data that was given to you at 25" of water, and you want to
make a comparison to other data tested at 28".  By looking at the chart, the multiplier is 1.06.  
Multiply each data figure from your original data by 1.06 to give you your desired figure at 28".  
So, if your head flow figure was 250 cfm at 25", then at 28" of water, your flow rate is 265 cfm.  
(250 x 1.06 = 265).

Simply find your current flow rate in the left side column and line it up with the desired flow rate
from the top of the chart.  Multiply your flow data figure by the multiplier in the desired box to get
the new figure.  

Please hit the refresh key if the chart fails to load properly.
Airflow Conversion Table







Orig.

Flow

Fig

Data
New flow figure data you desire
 
3"
5"
7"
10"
12"
15"
20"
25"
28"
30"
35"
40"
45"
3"
1.00
1.29
1.53
1.82
2.00
2.24
2.58
2.89
3.05
3.16
3.42
3.65
3.87
5"
.774
1.00
1.18
1.41
1.55
1.73
2.00
2.24
2.37
2.45
2.65
2.83
3.00
7"
.655
.845
1.00
1.12
1.31
1.46
1.69
1.89
2.00
2.07
2.24
2.39
2.54
10"
.548
.707
.837
1.00
1.09
1.22
1.41
1.58
1.67
1.73
1.87
2.00
2.12
12"
.500
.645
.764
.913
1.00
1.12
1.29
1.44
1.53
1.58
1.71
1.83
1.94
15"
.447
.577
.683
.816
.894
1.00
1.15
1.29
1.37
1.41
1.53
1.63
1.73
20"
.387
.500
.592
.707
.774
.866
1.00
1.12
1.18
1.22
1.32
1.41
1.50
25"
.346
.447
.529
.632
.683
.775
.894
1.00
1.06
1.10
1.18
1.28
1.34
28"
.327
.422
.500
.598
.654
.732
.845
.945
1.00
1.04
1.12
1.20
1.27
30"
.318
.408
.483
.577
.632
.707
.816
.913
.966
1.00
1.08
1.15
1.22
35"
.293
.378
.477
.535
.586
.655
.756
.845
.894
.926
1.00
1.07
1.13
40"
.274
.354
.418
.500
.548
.612
.707
.791
.837
.866
.935
1.00
1.08
45"
.258
.333
.394
.471
.516
.577
.667
.745
.789
.816
.882
.943
1.00