How do I cut a spin-in collar into a piece of round spiral duct

Plain-English answer

1. Place the spin-in collar flat against the spiral pipe and trace around the inside diameter with a marker. 2. Drill a pilot starter hole inside your marked line. 3. Use a pair of red or green aviation snips to cut out the circle cleanly, staying exactly on the line. 4. Insert the spin-in collar flange into the hole, press it firmly down until the mechanical tabs lock, and secure the perimeter flange using short tek screws before sealing with mastic.

Field checklist

• Place the spin-in collar flat against the spiral pipe and trace around the inside diameter with a marker.
• Drill a pilot starter hole inside your marked line.
• Use a pair of red or green aviation snips to cut out the circle cleanly, staying exactly on the line.
• Insert the spin-in collar flange into the hole, press it firmly down until the mechanical tabs lock, and secure the perimeter flange using short tek screws before sealing with mastic.

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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.

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