Duct fitting pressure drop coefficients for
blast gate
From ASHRAE (1989), with permission
![]() |
h / D |
Ah / A0 |
C0 |
0.2 |
0.25 |
35 |
|
0.3 |
0.38 |
10 |
|
0.4 |
0.50 |
4.6 |
|
0.5 |
0.61 |
2.1 |
|
0.6 |
0.71 |
0.98 |
|
0.7 |
0.81 |
0.44 |
|
0.8 |
0.90 |
0.17 |
|
0.9 |
0.96 |
0.06 |