Heating device, fixing device and image forming apparatus

A heating device comprising:

• a heating rotator;
• a pressing rotator being configured to press against the heating rotator to form a nip passing through a recording medium with the heating rotator;
• a heater disposed inside the heating rotator;
• a fan;
• a housing that houses the heating rotator and the pressing rotator,
• the housing having a pair of openings each configured to allow airflow generated by the fan to pass through each of the pair of openings;
• and
• a pair of shutters each configured to slide in corresponding one of the pair of openings in a longitudinal direction of the corresponding one of the pair of openings,
• each of the pair of shutters configured to slide between a position at which an outer end portion of the corresponding one of the pair of openings is opened in the longitudinal direction of the corresponding one of the pair of openings and a position at which an inner end portion of the corresponding one of the pair of openings is opened in the longitudinal direction of the corresponding one of the pair of openings.