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Cut fiber board with a red V-groove tool and a gray shiplap tool to create mitered corners and a shiplapped edge for duct sections
Hand tools for cutting fiber board sheets include a knife, straight edge, and color-coded edge-cutting tools
Right: A well-constructed air handler closet
Seal seams in fiber board ducts with out-clinching staples, UL-181A-approved tape, and mastic
Wrong: The door and filter were removed, allowing unfiltered air to enter the air handler leading to premature failure of the system due to dirt accumulation.