Heat extraction unit in an image forming apparatus

摘要

Heat exhaust holes are provided in a unit frame at positions just above respective imaging units (20). An exhaust fan (133) causes air heated at developing elements to be exhausted outside an apparatus via heat exhaust ducts (111) and a common duct (113). The heat exhaust holes are formed in different sizes depending on a position of the imaging unit (20). The closer the position of the imaging unit (20) is, the larger the heat exhaust hole provided above the imaging unit (20) is.
The holes may also be larger, the further the hole is provided from the exhaust fan.