HVAC Journeyman Practice Exam

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Which type of operated damper should not be placed in any equipment vent connector?

Automatically operated
Manually operated
Gear operated
Air operated

The correct answer is: Automatically operated

Automatically operated dampers are designed to respond to control signals, typically from sensors or a control system, to open or close as needed based on conditions like temperature or airflow. When placed in equipment vent connectors, these dampers could unintentionally obstruct airflow if they fail or if control signals malfunction. This poses significant safety risks, particularly in combustion appliances where proper venting is critical. If an automatically operated damper closes unexpectedly, it could lead to improper ventilation, potentially causing the buildup of harmful gases or combustion byproducts. In contrast, manually operated dampers require physical intervention to open or close, making it easier for technicians to monitor and ensure proper operation. Gear-operated dampers and air-operated dampers also have specific applications where their functionalities can be effectively controlled without risking unintended blockages in vent connectors. By adhering to guidelines that prohibit automatically operated dampers in these critical locations, HVAC professionals can help ensure safety and proper system performance.