An egg crate grille is a type of ventilation or air distribution component commonly used in HVAC (Heating, Ventilation, and Air Conditioning) systems. It gets its name from its appearance, resembling the structure of an egg crate or carton. The grille consists of a series of closely spaced, parallel, and intersecting blades arranged in a grid pattern, creating a grid-like appearance.

Egg crate grilles serve multiple purposes within a building's HVAC system. They are often used as return air grilles or exhaust grilles, allowing air to flow freely while preventing large debris from entering the system. These grilles are designed to provide an unobtrusive and visually appealing way to manage air circulation.

These grilles are typically made from lightweight and durable materials, such as aluminum or plastic. The open design of the egg crate grille promotes better air distribution and reduces the risk of pressure drop, ensuring efficient airflow throughout a space.

Egg crate grilles are commonly used in commercial and industrial settings, such as offices, hospitals, shopping malls, and various other public areas where HVAC systems are needed for maintaining comfortable indoor environments. They come in various sizes to fit different duct sizes and can be mounted on walls, ceilings, or floors, depending on the specific application.