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Removing unused expansion card slot covers is not advisable for maintaining a cool computer because, while it may seem like it allows for better airflow, this action can actually lead to dust and debris entering the case more easily. This can result in obstructing airflow, causing overheating and negatively affecting the overall performance of the computer.

Proper airflow through the case is vital for cooling components efficiently. This ensures that warm air is expelled and cooler air is drawn in. Keeping the vents clean is critical as dust buildup can restrict airflow, leading to increased temperatures. Regularly checking cooling fans for dust buildup helps maintain their effectiveness, preventing overheating. Each of these actions contributes positively to maintaining a cooler computer, unlike removing slot covers, which can unintentionally compromise the system's cleanliness and performance.