What is the recommended size for openings in the screen for outdoor air intake and exhaust?

The recommended size for openings in the screen for outdoor air intake and exhaust is between 1/4 and 1/2 inch. This range strikes a balance between allowing sufficient airflow while preventing the entry of pests and debris into the ventilation system. Openings that are too large could allow unwanted insects and vermin to enter the structure, compromising indoor air quality and creating potential health hazards. Conversely, openings that are smaller than 1/4 inch may restrict airflow, leading to inadequate ventilation and potentially causing moisture buildup or reduced air exchange rates. The specified range of 1/4 to 1/2 inch is effective in ensuring that the system operates efficiently while maintaining a barrier against contaminants. This standard is commonly accepted in building codes and best practices for ventilation design.