Our range of Greenhouse Vents ensure that there is a healthy supply of Ventilation within your greenhouse. By circulating air within the greenhouse, not only is the air kept cool but also the air movement helps prevent mildew and damping. Ideally greenhouse ventilation will include both Louvre Vents and Roof Vents. A combination of both types of greenhouse vents allows for optimum performance, allowing hot air to escape through the roof through the roof vents and cool fresh air to be dragged in through the side louvre vents. Automatic greenhouse vents are a must for every keen greenhouse owner. Automatic vents work by heat expansion which allows the vent to open gradually as the temperature rises. Check out our range of greenhouse vents including popular models from Bayliss and Thermoforce.