Chimney Safety Institute of America (CSIA) Certification Practice Test

What percentage of the connector should connector dampers not block when closed?

1. 50%

2. 60%

3. 70%

4. 80%

The correct answer is: 80%

When discussing connector dampers and their operation in chimney systems, it's crucial to understand the ideal functioning to maintain efficiency and safety. Connector dampers are designed to prevent airflow when not in use, providing effective closure to reduce heat loss and prevent backdrafts. However, to ensure proper ventilation and establish a functional draft when the appliance is in operation, these dampers should not block a significant percentage of the connector when they are closed. The correct percentage that connector dampers should not block when closed is 80%. This allows for sufficient airflow during operation, ensuring that appliances can vent properly while preventing excessive heat loss when they are not in use. Blocking too much of the connector can hinder the performance of the heating appliance, which can lead to inefficiencies and potential safety hazards, such as the buildup of harmful gases. Therefore, maintaining an 80% clearance ensures that the system works as intended, providing both safety and efficiency.