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- Lever-operated opposed blade damper for square necks; heavy-gauge steel construction
- Available in square sizes (in 3" increments): 6"x6" - 24"x24"
- Gang-operated opposed blades meter air volume precisely with minimum air disturbance
- Fits duct dimension minus 1/4" neck
- Works with SpecAire models: AL1, AL3 and AL6
- Flat black finish eliminates reflection