From which direction must inlets to masonry chimneys enter?

Inlets to masonry chimneys must enter from the side to ensure proper draft and airflow within the chimney system. This design allows for the efficient removal of exhaust gases while minimizing the risk of backdrafts and ensuring that the ventilation system operates effectively. By allowing inlets to be positioned on the side, it facilitates better management of the flow of air and combustion gases, which is essential for the safe operation of fireplaces and wood stoves connected to the chimney.

In contrast, if inlets were positioned at the top, bottom, or front, they may disrupt the intended flow dynamics, potentially leading to performance issues or increased safety hazards, such as smoke backflow into the living space. Proper positioning of inlets is crucial for ensuring that the chimney draws air properly and maintains a safe and efficient exhaust of combustion products.