How do I keep my flex duct cuts clean without tearing the inner core?

Use a dedicated dual-blade insulation knife to slice cleanly through the outer vinyl jacket and the fiberglass insulation core down to the wire ribbing. Use heavy-duty wire side-cutters (dikes) to snap the internal coiled spring steel wire cleanly. Never try to cut the spring wire using your aviation metal snips, or you will ruin the snip blades instantly.

['Use a dedicated dual-blade insulation knife to slice cleanly through the outer vinyl jacket and the fiberglass insulation core down to the wire ribbing. Use heavy-duty wire side-cutters (dikes) to snap the internal coiled spring steel wire cleanly. Never try to cut the spring wire using your aviation metal snips, or you will ruin the snip blades instantly.', '--']

Stop if

• Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

Check

• Use a dedicated dual-blade insulation knife to slice cleanly through the outer vinyl jacket and the fiberglass insulation core down to the wire ribbing. Use heavy-duty wire side-cutters (dikes) to snap the internal coiled spring steel wire cleanly. Never try

Steps

• Use a dedicated dual-blade insulation knife to slice cleanly through the outer vinyl jacket and the fiberglass insulation core down to the wire ribbing. Use heavy-duty wire...

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