Patent ID: 6375563
Filing Date: 2002-04-23
Classification: F24F,Y02B

Abstract:
A ventilating apparatus for a building with a roof, comprising:a roof having openings for exhausting or supplying air; a reversible direction propeller fan having a motor, said fan and motor fixedly secured to said roof, said motor controlling the fan speed and direction; a reversible direction variable frequency drive electronically interfacing with the motor of the fan to control the speed and the direction of said fan wherein the direction of the variable frequency drive matches the direction of the fan; a diffuser pan fixedly secured to a ceiling of the building underneath the opening in the roof of the building, said diffuser pan being larger in size than the opening in the roof of the building; a power supply for the variable frequency drive; a first temperature control apparatus operatively engaging said variable frequency drive and controlling the direction of said drive, said first temperature control apparatus measuring the outdoor temperature; said first temperature control apparatus changing the direction of said drive when the outdoor temperature reaches a preset level; and, a second temperature control apparatus operatively engaging said variable frequency drive and controlling the speed of said drive, said second temperature control apparatus measuring the indoor temperature; said second temperature control apparatus altering the speed of said drive dependent on the measured indoor temperature.