VENTILATION DEVICE

PROBLEM TO BE SOLVED: To provide a ventilation device which can be easily installed also in a room of an existing house, and measures a temperature difference between an indoor temperature and an outdoor temperature to conduct mechanical ventilation of a ventilation air in an amount insufficient with regard to a natural ventilation amount so that the ventilation device has high energy saving effect and is quiet. SOLUTION: The ventilation device which comprises an air supply fan and an air discharge fan, forcibly discharges indoor air, takes outside air and can secure a desired ventilation air amount, is configured to calculate a natural ventilation air amount obtained by a difference between temperature output values detected a first temperature detector which detects an indoor temperature and a second temperature detector which detects an outdoor temperature, and a preset airtight performance of a house, and control a forcible ventilation air amount by the air supply fan and air discharge fan to an air amount obtained by subtracting the natural ventilation amount from the desired ventilation air amount. COPYRIGHT: (C)2005,JPO&NCIPI