CATALOG - ENG v6

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Dampers – Back-draft dampers A pressure relief damper is a backdraft damper with an adjustable start-open pressure. This damper is capable of maintaining a relatively constant pressure at various airflows and which closes upon a decrease in differential pressure. Pressure relief dampers do not immediately open fully upon reaching their start-open pressure. They maintain tight leakage to approximately 60% of the start-open pressure and have a relatively flat flow control somewhat above the start-open pressure. Counterbalance weights are mounted externally for easy adjustment and balancing in the field. A pressure relief damper is generally used as a safety or controlling device. In a duct section, it would be mounted on the duct to either relieve an unexpected overpressure or to relieve negative pressure downstream. Backdraft dampers are used in ventilation systems to allow airflow in one direction and prevent airflow in the opposite direction. A pressure relief damper is developed with an elevated and adjustable startopen pressure while providing the backdraft function. When selecting the correct damper for your application, you need to know: • System velocity and back pressure requirements • Mounting orientation and airflow direction • Mounting configuration (inserted into duct/opening or flange mounted) • Damper operation (gravity) • Start-open pressure Built using no welding technology this ensures: • Lower manufacturing costs • Easier and less expensive to transport • Safer and more eco-friendly installation • Easier to handle and unload • Easier to reconfigure and repair. 13
Performance data example: Back-draft performance data Damper Width Maximum Maximum Leakage Inches (MM) Back Pressure System Velocity Percent of Max. Flow CFM/ Sq. Ft. 48” (1219) 4.0” w.g. 2500FPM .7% 17.5 36” (914) 8.0” w.g. 2500FPM .8% 20 24” (610) 12.0 w.g. 2500FPM .9% 23 12” (305) 16.0 w.g. 2500FPM 1.6% 40 Blades start to open Blades fully open .02” w.g. .05” w.g. 14
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CATALOG - ENG v6

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