| 摘要 |
PURPOSE: To provide a natural air supply device to effect efficient heating of intake air only when there is a need for regulation of temperature of intake air at a time when a flow of intake air is produced on the indoor side of an air support port. CONSTITUTION: An air support opening 2 is formed through the interior of a frame body 1. A plurality of heaters 4, an air direction detecting means 6 to detect the direction of the flow of intake air flowing through an air supply opening 2 and output a power applying signal 5 when the flow of intake air is divected to the indoor side; and a power control means 7 to feed a power to the heater 4 when a power applying signal 5 outputted from the air direction detecting means 6 is inputted are arranged in the air supply opening 2. An electric wiring 8 to feed a power from the outside of the frame body 1 is connected to the power control means 7. |
