Image forming apparatus having a blocking member that changes a width of an opening of an air blow portion

An image forming apparatus comprising:

• an image forming portion configured to form an image on a recording material;
• a fixing device having a nip, and configured to fix the image on the recording material while nipping and feeding the recording material on which the image is formed;
• a cooling fan configured to feed air;
• a first blow portion through which the air fed by said cooling fan flows toward a first area, which is an end portion of said fixing device, in a longitudinal direction of said fixing device, so as to cool the first area by the air via an opening of said first blow portion;
• a blocking member configured to change a width of the opening of said first blow portion;
• and
• a second blow portion, branched from said first blow portion so as to cross said first blow portion, through which the air blocked by said blocking member flows toward a second area, which is a region the recording material passes through said nip.