Outdoor Air Conditioner Unit Cover. It is a navy blue fabric cover designed to provide comprehensive protection for the external condensing unit of a split air conditioner, which is typically mounted on a wall. Its primary function is to shield the outdoor unit from harsh weather conditions such as heavy rain, dust accumulation, and intense direct sunlight during periods when the unit is not in use. This type of protective cover helps prevent rust and corrosion, maintains the cleanliness of the components, and thereby prolongs the lifespan and efficiency of the air conditioner.