The wet curtain fan system provides a simple, eco and efficient cool channel. The machinery needed is just bump and exhaust blower. Use together with sun shading system, the effect of cooling will be much more better.The wet curtain is installed on one side of the greenhouse ,and fans are at the opposite side ,When fans is working ,the indoor will gain negative forcing the unsaturated outdoor air be humid and flowing through the surface of wet curtain , that the indoor temperature will reduce 4ºC-12ºC . And continuously air into the House ,reach cooling effect.Use together with sun shading system, the effect of cooling will be much more better.