PURPOSE:To keep air to be sent through a discharge port into a house even in winter season at a temperature close to an indoor temperature so as not to give uncomfortable feeling to a user by forming a flowpath connecting a suction port to a discharge port in an air feed port main body having a suction port communicating with the outside of the house and a discharge port communicating with the interior of the house, and providing a freely opened and closed shutter and a heating element in said flowpath. CONSTITUTION:A cylindrical air feed port 1 having a suction port 2 and a discharge port 3, is provided at its inner part with a freely opened and closed shutter 4 and a heating element 5. When a ventilation fan 6 is operated, indoor air is discharged as shown by arrows C D. At this time, when the shutter 4 of the air feed port main body 1 is opened, outdoor air is introduced into the air feed port main body 1 through the suction port 2, and is sent into the interior of the house as shown by arrows A B through a discharge port 3. Thus, sufficient air feeding is carried out. However, when used in winter season, air sent from the outside of the house to the interior thereof as shown by arrows A B has an extremely low temperature, and this imparts uncomfortable feeling to the user. Therefore, upon this occasion, when power is supplied to the heating element, it warms air of the extremely low temperature and makes the temperature equal to the temperature of indoor air, and then it can be sent into the house.
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