An inorganic fiber containing silica and magnesia as the major fiber components which further includes an intended strontium oxide additive to improve the thermal stability of the fiber. The method further comprising installing, on the system, an third-party software product that uses the HASS. The air conditioner is provided with cleaning brush driver 20 that draws the cleaning brush from the dust box 21 and brings the cleaning brush into contact with the filter during cleaning of the filter and that separates the cleaning brush from the filter and puts the cleaning brush in the dust box 21 when the filter is not cleaned. The inlet chambers and the overflow chambers are adapted to be pressed against each other respectively. Information about the input image is extracted from the input image, and a target position on the input image is calculated on the basis of the extracted information.