Cubic Foot Per Minute (CFM) to Litre Per Year (L/yr) is a conversion used to express airflow rates in different units. CFM measures the volume of air flowing through a space in a minute, while L/yr measures the volume of air in litres over a year. This conversion is essential in various fields, including HVAC (heating, ventilation, and air conditioning) engineering, industrial ventilation, and air quality monitoring. By converting CFM to L/yr, professionals can accurately assess airflow rates in buildings, factories, and other environments, ensuring optimal air circulation, temperature control, and indoor air quality.