Air Systems Cleaning Specialist (ASCS) — Question 6

Service openings shall NOT be made in what type of duct?

Answer options

• A. Duct board
• B. Fibrous glass
• C. Metal
• D. Flexible

Correct answer: D

Explanation

Service openings should not be made in flexible ducts because they can compromise the duct's integrity and create airflow issues. Duct board, fibrous glass, and metal ducts can accommodate service openings without significant impact on their performance.