The inventive air heater comprises a housing with a lining, a nozzle, a dome with a prechamber, which is coaxially positioned in the top part thereof and is provided with a housing and a lining provided with an independent support on the housing. In addition, a method can be used to dynamically remap a memory page stored in a non-mirrored memory region of memory to a mirrored memory region. Location data relating to the target users is retrieved from a plurality of location data sources and the reliability of the data is then verified and the data is then stored on a computer readable medium. At least one glue receiving groove is formed at a location in which the print head and the channel unit are adhered to each other. A stable aqueous dispersion of a fluorocopolymer obtained in such a manner that a fluorocopolymer comprising polymerized units based on a vinyl monomer having a reactive group as the base is subjected to a composite treatment or a mixing treatment with a acrylate containing a reactive group capable of forming a bond by reaction with the above reactive group or the like.