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Heavy Backdraft Damper
Description：
- Depth：220mm
- Frame：16 GA Galvanized Steel
- Bearings：Non-oil bushings
- Counter Weight：Adjustable
- Blade material：Aluminum extrusion aluminum alloy blade
- Blades operation type：Parallel
- Maximum size：Unlimited (disassembly depending on size)
- Minimum size：250mm×250mm