What is the minimum mesh size for screens used in louvers and grilles?

The minimum mesh size for screens used in louvers and grilles is specified as 1/4 inch. This size is chosen to balance effective airflow with the requirement to filter out larger debris and pests. A mesh size of 1/4 inch strikes a good compromise, allowing sufficient ventilation while preventing unwanted items from entering the system.

Larger mesh sizes, such as 1/2 inch or 3/4 inch, may allow too many particulates to pass through, diminishing the system's efficiency and effectiveness in protecting the mechanics involved. Conversely, smaller mesh sizes like 1/8 inch could restrict airflow too much, leading to reduced system performance and potential overheating or increased wear and tear on the components.