A room air conditioner built into the ceiling with slim and flat configuration. Its invisible air intake / outlet slits are designed to reduce visual noise and to make the product a quiet, unobtrusive object with long-life esthetics to suit a diverse range of room interiors. Its energy saving performance has already satisfied the Japanese government’s 2012 Annual Performance Factor, the APF-standard. The unit features an automatic air filter cleaning function for reducing maintenance workload.