Ventilation hood

A ventilation hood comprising:

• a main frame module which faces an appliance accessible from a front of the appliance, the main frame module comprising:
• a first surface,
• a second surface opposite to the first surface,
• a third surface which if perpendicular to the first surface and disposed on an outer lateral portion of the first surface, the third surface comprising a bracket extended from the front of the appliance to a rear of the appliance which is opposite to the front,
• the bracket of the main frame module having a first assembly structure, and
• a through-hole passing through the first surface and the second surface;
• an expansion module removably attachable to the main frame module, the expansion module comprising:
• a bracket extended from the front of the appliance to the rear of the appliance and having an assembly structure at which the expansion module removably attaches to the first assembly structure of the bracket of the main frame module, and
• a coupling surface of which the bracket is comprised;
• a motor module disposed on the first surface of the main frame module and configured to suck in air through the through-hole of the main frame module, the motor module comprising a duct, a motor having an axis, and an exhaust fan which is driven by the motor and defines a blowing direction of the exhaust fan perpendicular to the axis of the motor;
• and
• a controller configured to control operation of the ventilation hood and a rotation velocity of the exhaust fan in the motor module.