Setting of greenhouse vents
The setting of the air vent is a key part in the construction of the greenhouse. However, due to the difference in the structure of the shed, the position of the air vent is different when it is set.
The canals (ie corridors) of most greenhouses are generally located near the back wall, so there will be two rows of columns on both sides of the canal, and the location of the air outlet is generally near the columns on the south side of the canal. The location of the air vent is different, and the shed facilities and management methods related to the air vent are also different.
Some shed air vents are on the south side of the pillars, just above the vegetables. When the air vent is opened, the cold wind will directly blow the vegetables, and at the same time, some debris generated from the shed covering such as straw curtains will directly fall on the vegetables, which will affect the growth of the vegetables.
Therefore, for the air outlet at this position, a windshield film needs to be provided at the bottom of the air outlet, on the one hand, it prevents the wind from directly blowing on the vegetables, and on the other hand, it prevents debris from falling on the vegetables. When encountering rainfall, the rainwater changes its flow direction due to the windshield, which will scour the roots of the rear wall. Therefore, a film of 1 to 1.5 meters high should also be installed near the root of the rear wall to prevent the rainwater flowing down from the windshield The scour of the wall.
Some air vents are on the north side of the pillar, just above the canal. The air vent at this location is far away from the vegetables, and it will not affect the vegetables due to grass curtain debris and precipitation. However, because the vent here is closer to the back wall, precipitation will affect the back wall. Therefore, for the air vent at this location, it is necessary to wrap the entire rear wall with a film to prevent rainwater from washing away.
No matter what kind of shed structure, a reasonable air vent should be set at a distance of 1.5 to 2 meters from the highest point on the rear roof. It is not good to be too far or too close. If the air vent is set far away (more than 2 meters), when the air vent is opened, there is still a distance near the side of the shed covering. The shed covering needs to be lowered to hold it down. If the air vents are set at a short distance (less than 1.5 meters), most of the space will be occupied after the shed covering is rolled up, and the opening distance of the air vents will be blocked, which will affect the ventilation of the shed.
Therefore, when setting the location of the air outlet, it is recommended to first determine the position of the shed covering and the space it occupies, and then reasonably set other corresponding facilities according to the location of the air outlet.
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