LETTER TO THE EDITOR: Spectral gap of doubly stochastic matrices generated from equidistributed unitary matrices

The image forming apparatus includes a housing, image forming device provided in the housing for forming a toner image onto a sheet, and a fixing device provided in the housing for heating the toner image to be fixed on the sheet. A passageway is provided adjacent to the fixing device for intaking air substantially directly from the exterior of the housing and exhausting out to the exterior so as to form a cooling passageway. An airflow controller is provided for causing said air flow to form the cooling passageway.