1.FK027-O.B.D 2.aluminum material 3.damper can be set in any position from fully open to fully closed. 1.FK027-O.B.D 2.aluminum material 3.damper can be set in any position from fully open to fully closed. design sketch:1.aluminum material struction2.perfect desig3.damper can be set in any position from fully open to fully closed4.size is cousmized O.B.D
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