| 1. | Greenheck Fan Ventilation Hood DFD-155 User Guide r GREENHECK _ Model DFD 155 Dynamic Rated FIRE DAMPERS Application Model DFD 155 is approved for use in walls floors and partitions with fire resistance ratings less than 3 hours This model carries a V 2 hour UL fire damper label UL 555 classifies dynamic rated fire dampers fo |
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