Greenhouse glass greenhouse natural ventilation relies on natural ventilation most of the time to adjust the indoor environment. In the form of large-scale structure of production of glass greenhouse is generally double slope Greenhouse, greenhouse, ventilation louvers in the form of a side wall and roof settings. The total area of ??its ventilation is not less than 15% of the area of ??the greenhouse, preferably greater than 30%. When the roof shutters open, the sash can be more than the best level upward tilt, northeast to build greenhouses, when fully open 100 angle to the horizontal, then get a good ventilation. Natural ventilation ventilation and wind speed, wind direction, louver position, venting about the area and the temperature difference between indoor and outdoor temperature. When the louver 27% of the total area of ??the indoor area of ??the time, if only roof ventilation, greenhouse construction team, even if the outdoor wind speed reaches 10 km / h, is also less than ideal ventilation rate of 0.75 times per minute; when the roof and sidewall venting louver when fully opened, with almost no wind, the ventilation rate can reach 0.68 times / minute, close to the normal recommended 0.75 beats / minute ventilation rate. "Protection after slope" is the key greenhouse wall maintenance. The method is for the new greenhouse, to wait for a good level "after the roof" good soil after use of a new plastic film covering the entire back wall. If want to reduce costs, you can use the old films, greenhouse cost, but you want to stick with tape breakage, ensure protection against rain and snow can not penetrate, to protect the wall. And then on top of plastic film, covered with a layer non-woven material sun, but also play a role in weed control. Greenhouse | Tianrun vegetable wholesale | greenhouse cost by the Cangshan County Tianrun cultivation of professional cooperatives. Greenhouse | Tianrun vegetable wholesale | greenhouse cultivation cost is Cangshan Tianrun cooperatives (www.tianrun8.net) this year introduced a new upgrade, the above picture is for reference only, please call the telephone or pictures on this page, For the latest information, contact: Sun Jinhu.