The Side Louvre Window can be added into existing greenhouse and replaces an entire upper or lower panel on the side of the greenhouse. It will helps reduce humidity and provides a better circulation. Best way to avoid high temperature on summer days. Plastic. Keeps humidity levels down. Increases airflow and improves air circulation. 10 louvered window operated manually, to swing in our out. Size H5, W64, D69cm. Weight 2.5kg.