Flow Bench Airflow

Conversion Chart Multipliers


Flow Wanted

Actual Flow

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 .442 .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 .447 .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