An image forming device includes a housing; a conveying belt, and a retaining member. Each fairing has two halves, with each half having a recess, or groove, to accommodate the cable. The data manipulation device is arranged to carry out the conversion by applying a pseudo-inverted form of a point-spread function matrix to a column vector representing the requested pattern. In the past, it has been somewhat difficult to control the shape of the entry ports when the manifold was molded of a single part. Then, the surface of the film is attached onto a surface of a substrate. Weight ratio of flow rate of primary recirculating exhaust gas tonh to amount of pulverized coal from a mill tonh is defined as GC, and the flow rate of primary recirculating exhaust gas is controlled so that the GC falls within a given range.