Torque Requirements
Series 1000 / 1000 SW / 1500 / 1500 SW
9000 / 9000 SC / 9000 SW / 9000 BF / 9000 ECT
Note: Tested dampers are “Flanged to Duct” type.
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SEALING TORQUE (in.-lbs.)
up to 2 in. and 1000 fpm face velocity
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| Values in Sealing Torque chart (left) reflect the maximum torque requirements up to 2 in. w.g. and/or 1000 fpm face velocity. Refer to Velocity or Pressure Torque charts (below) if system design surpasses criteria of Sealing Torque chart. Base torque requirements on the greatest value obtained. |
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VELOCITY TORQUE (in.-lbs.)
at 1000 fpm face velocity
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| Multiply value in Velocity Torque chart by the multiplier listed below to obtain torque for greater design face velocity. |
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PRESSURE TORQUE (in.-lbs.)
at 2 in. w.g. differential
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| Multiply value in Pressure Torque chart by the multiplier listed below to obtain torque for greater design pressure. |
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NOTE :
Refer to Blade Design Pressure Limitations to ensure that the damper is within the stated design limits in respect to maximum static pressure. (See Series 9000 BF/9000 ECT/9000/9000 SC/1500/1000 literature.)
