Gas Fitter Practice Test 2025 - Free Gas Fitter Practice Questions and Study Guide

The correct answer, which focuses on sheet metal screws, is justified because this method provides a secure and reliable connection for single wall vent connectors. Sheet metal screws are specifically designed to fasten metal components together effectively, ensuring that the joints maintain their integrity and leak-resistance under varying temperatures and conditions, which is essential for safe venting of gases.

Using sheet metal screws ensures that the assembly can withstand the mechanical stresses that may arise during operation, making them a preferred choice in many gas fitting applications. This choice also contributes to minimizing the risk of gas leaks, enhancing safety in gas installations.

In contrast, the other options, while they may have their uses in different contexts, do not meet the necessary standards for secure joining of vent connectors. Duct tape does not provide the mechanical strength required for a lasting bond in high-temperature environments. Pop rivets, while they can join materials, might not provide the necessary sealing against gas leaks. Silicone or adhesive can offer a level of bond, but they are not typically approved or recommended for structural connections in vent systems, where safety and compliance with building codes are critical.