Duct insulation may cover a service opening when it is not identified.

• A. True
• B. False
• C. Not enough information
• D. Depends on insulation type

Answer: (B)

Access to duct service openings must be preserved for inspection and maintenance. Duct insulation should not cover a service opening, especially if it isn’t clearly identified, because that blocks access and makes it impossible to know what is behind the opening or to service it. For proper practice, any service opening should remain readily reachable and clearly labeled, with an accessible panel or removable section that allows service without removing insulation. Insulation can wrap around the opening, but the opening itself must still be accessible and identifiable. Therefore, the statement is not allowed.