A vent grill is a type of ventilation component commonly found in heating, ventilation, and air conditioning (HVAC) systems, as well as in kitchens, bathrooms, and other areas of buildings where air circulation is important. It is a grille-like structure that is designed to cover an opening in a wall or ceiling through which air can flow in or out. The primary function of a vent grill is to allow air to flow in and out of a space while preventing the entry of foreign objects such as debris, insects, or animals. Vent grills may also be equipped with filters to remove impurities from the air, or louvers to control the direction and volume of the air flow.