Usually the factory made polycarboante greenhouses are equipped with two vents, which are installed in the door frames. However, in case of a particularly hot weather, two vents will not be enough to ensure appropriate ventilation of the greenhouse. Also, lack of ventilation within greenhouse can be caused by the size of the greenhouse. Experienced gardeners know that all plants need warmth, however, if the temperature will be too high, the plants will die.
First thought is to open doors for venting, however, it is wrong because it will cause drafts! If your greenhouse is six meters long or longer, even if you will open both doors the temperature will remain high within the greenhouse.
There is one solution: use additional vents on the sides. Ventilation is essential for harvest.
Additional vents allow to control temperature and humidity in greenhouses. For the most efficient use of vents you will need to plan the number and location of vents.
Advice on choosing additional vents for your greenhouse:
If your greenhouse is surrounded from the sides by other buildings, which cover the greenhouse from wind, you will need several vents.
If your greenhouse is an open, windy area, we recommend using a minimal amount of vents.
Greenhouses with partitions inside for growing separate cultures should be equipped with as many vents as possible.
For greenhouses placed from west to east a small number of vents will do. You should increase the number of vents if your greenhouse is placed from north to south.
Depending on the length of the greenhouse the calculation of additional vents is following: 1-2 vents are enough for a 4 meters long greenhouse; 6 meters long greenhouse would require 2-4 vents; 8 meters - 3-6 vents, 10 meters 4-8 vents.
Choosing areas of installation of additional vents:
We recommend placing vents on the south side of the greenhouse since this side is heated most rapidly. Installing vents on the north side of the greenhouse is only advisable if the greenhouse is surrounded by trees or buildings, which protect the greenhouse from cold northern wind gusts.
It is recommended to place vents closer to the top of the greenhouse. This is where temperature is the highest.
First of all install vents in the central part of the greenhouse. Afterwards install vents as necessary.
Evaluate free space. Take into account that the link beam that connects arcs can obstruct installation of a handle or ventilation device.
Do not place vents near exits.