greenhouse fan. heat removal/storage

A New(?) way to get excess heat out of a greenhouse, plus it recycles the heat.

http://www.youtube.com/watch?v=Asxwnj3PpU4

A New(?) way to get excess heat out of a greenhouse, plus it recycles the heat. This is a trench type greenhouse, making good use of the 50 degree(10 degree c.) temperature of the soil 3 feet(1m.) down. Also, a removable double layered greenhouse panel of a new design is used.