Missing insulation thickness when measuring clearance

Include insulation thickness when measuring clearance. Finished duct is bigger than bare duct.

Stop if

• Does this measurement include insulation thickness and finished clearance?

Watch out

• Do not install bare duct in a space that will fail after insulation.

Check

• Find insulation/liner schedule.
• Add wrap/jacket/liner thickness to clearance thinking.
• Check around beams, walls, ceiling grid, hangers, and access panels.
• Verify pinch points.
• Ask if clearance only works without insulation.

Steps

• Find insulation/liner schedule.
• Add wrap/jacket/liner thickness to clearance thinking.
• Check around beams, walls, ceiling grid, hangers, and access panels.
• Verify pinch points.
• Ask if clearance only works without insulation.

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