From where should the steel line exit the duct?

From where should the steel line exit the duct?

• A. From the center
• B. From the top
• C. From the bottom
• D. From the side

Answer: (A)

When a steel line passes through a duct, the exit location matters for protecting the line and ensuring a clean, secure transition. Exiting from the center provides equal clearance to all sides of the duct walls, which minimizes rubbing and wear on the line from movement or vibration. It also makes it easier to install proper seals and supports on both sides of the penetration and to avoid sharp bends or kinks that can develop if the line hits a lip or edge. A side, top, or bottom exit tends to press the line against a duct wall, increasing wear, complicating sealing, and concentrating stress as the line expands, contracts, or shifts with use. So centering the exit offers the best combination of protection, ease of installation, and long-term reliability.

When a steel line passes through a duct, the exit location matters for protecting the line and ensuring a clean, secure transition. Exiting from the center provides equal clearance to all sides of the duct walls, which minimizes rubbing and wear on the line from movement or vibration. It also makes it easier to install proper seals and supports on both sides of the penetration and to avoid sharp bends or kinks that can develop if the line hits a lip or edge. A side, top, or bottom exit tends to press the line against a duct wall, increasing wear, complicating sealing, and concentrating stress as the line expands, contracts, or shifts with use. So centering the exit offers the best combination of protection, ease of installation, and long-term reliability.