Openings in exhaust ducts shall be covered with corrosion-resistant screens of what minimum mesh size?

The minimum mesh size of 1/4 inch for covering openings in exhaust ducts with corrosion-resistant screens is appropriate because it strikes a balance between preventing the entry of larger debris while still allowing efficient airflow. This size helps to ensure that the exhaust system remains functional and effective, maintaining proper ventilation. Furthermore, using a smaller mesh could increase the likelihood of clogging due to the accumulation of finer particles, which would impede the exhaust flow and potentially lead to operational issues. On the other hand, a larger mesh, such as 1/2 inch, might not sufficiently guard against larger debris, thereby compromising the system's efficiency. Therefore, 1/4 inch is established as the standard to optimize both protection and performance in exhaust duct applications.