Mask apparatus

A mask apparatus comprising:

• a mask body;
• a seal disposed at a rear surface of the mask body and configured to contact a user's face, the seal defining a breathing space configured to accommodate the user's mouth or nose or both based on the seal contacting the user's face;
• a fan module disposed at a front surface of the mask body and configured to receive external air, the fan module defining a fan outlet configured to discharge the external air toward the breathing space;
• and
• a mask body cover that covers the fan module and is coupled to the front surface of the mask body,
• wherein the mask body comprises:
• an air duct configured to guide the external air from the fan module to the breathing space, the air duct having (i) a duct inlet configured to communicate with the fan outlet and (ii) a duct outlet configured to communicate with the breathing space, and
• an air exhaust hole configured to discharge air exhaled into the breathing space to an outside of the mask body,
• wherein an area of the duct outlet is greater than an area of the duct inlet, and
• wherein the air duct comprises:
• a front surface portion spaced apart from the front surface of the mask body and disposed forward relative to the front surface of the mask body,
• a side surface portion that is disposed at a side end of the front surface portion and defines the duct inlet,
• a top surface portion that connects an upper end of the front surface portion of the air duct to the front surface of the mask body,
• a bottom surface portion that connects a lower end of the front surface portion of the air duct to the front surface of the mask body, and
• a cutoff portion that defines the duct outlet, the cutoff portion being defined by a rear end of the side surface portion, a rear end of the top surface portion, a rear end of bottom surface portion, and a rear side of the front surface portion.