LED air return light fixtures are designed for installation with HVAC (heating, ventilation, and air conditioning) systems. They are typically mounted in a drop ceiling. The LED air return light fixtures are energy-efficient and long-lasting, and they are used to help improve indoor air quality by providing illumination. They are also used to provide an aesthetically pleasing and functional lighting solution in HVAC systems, and they can be easily integrated with building control systems for lighting control and management.