ENGINEERING MANUAL OF AUTOMATIC CONTROL
DAMPER SELECTION AND SIZING
446
Damper Sizing ............................................................................................................ 457
System Characteristics........................................................................ 457
Damper Characteristics ....................................................................... 458
Inherent Characteristic .................................................................... 458
Installed Characteristic.................................................................... 458
Determining Damper Size ................................................................... 459
Other Damper Sizing Considerations.................................................. 461
Two-Position Control ....................................................................... 461
Modulating Control .......................................................................... 461
Oversized Damper Characteristics...................................................... 461
Damper Performance ...................................................................... 461
Control System Sensitivity .............................................................. 461
Damper Pressure Drop ............................................................................................................ 462
Damper Applications ............................................................................................................ 463
Mixed Air Control ................................................................................. 463
Face and Bypass Control .................................................................... 464
Throttling Control ................................................................................. 464
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