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Fastening joints in vent connectors using sheet metal screws is the preferred method because it ensures a secure and reliable connection that can withstand the operational stresses and temperatures associated with HVAC systems. Sheet metal screws provide strong mechanical fastening that prevents the joints from coming apart, which is crucial for maintaining the integrity of the ventilation system and ensuring proper airflow. This method also allows for easier disassembly in the future if repairs or maintenance are needed.

Other fastening methods, such as duct tape, may not provide the same level of durability and can degrade over time, potentially leading to leaks. Solder joints would not be appropriate for connecting sheet metal vent connectors, as soldering is more suitable for copper or similar materials and doesn't hold up well under high-temperature conditions that might be present in ventilation applications. Plastic ties, while useful in some applications, do not provide the structural integrity necessary for vent connector joints. Thus, using sheet metal screws is the best practice for fastening these joints securely.