North Carolina Home Inspector Practice Exam

The fireplace flue size should be what fraction of the fireplace opening?

1. One-fifth

2. One-tenth

3. One-fourth

4. One-sixth

The correct answer is: One-tenth

The fireplace flue size should be one-tenth of the fireplace opening. This guideline is based on the principle that a properly sized flue is essential for efficient drafting of smoke and gases. A flue that is too small will restrict the flow of smoke, potentially leading to backdrafts and poor combustion, while a flue that is too large may not create enough updraft to effectively vent the smoke. The one-tenth ratio allows for optimal airflow, ensuring that the fire burns effectively and that smoke is properly expelled from the home. Proper flue sizing not only enhances the performance of the fireplace but also contributes to safety by minimizing the risk of harmful gases entering the living space. This information is critical for home inspectors to evaluate the performance and compliance of fireplaces in residential properties.