New York Low Pressure Boiler Certificate of Fitness (COF) 2025 – 400 Free Practice Questions to Pass the Exam

Improper flue damper construction can lead to a potential flue gas backdraft, which is a serious safety concern. A flue damper is designed to regulate airflow and ensure that flue gases are expelled efficiently from the boiler. When constructed incorrectly, it may not open or close properly or may become stuck, which can cause flue gases to flow back into the combustion chamber or living space instead of venting outside. This backdraft can lead to the accumulation of harmful gases, such as carbon monoxide, posing significant health hazards to occupants.

While other choices may seem relevant, they don't capture the critical safety risk posed by improper construction of flue dampers. Increased efficiency, risk of combustion, and reduction in heating performance don't encapsulate the immediate danger of poisonous gas entering living areas, making the potential for flue gas backdraft the most pertinent consequence in this context. Proper construction and functioning of a flue damper are essential for both operational efficiency and safety in a boiler system.