| 摘要 |
A device fitted into the top end of the chimney or air duct has a top part which is heated up by the sun and then transfers heat to a bottom part inside the chimney or duct. The draught exiting the air outlet duct is increased using a device formed by an outer housing part (2) that protrudes outside the duct and is capable of absorbing solar energy, and an inner housing part (1) linked to the outer part, which can accept heat from the outer part and is located inside the duct at its top end. |
