GAVO Adjustable ventilators is a large range of standard grilles for easy and simple covering of ventilation ducts and window openings. Due to the many shapes and various sizes, the GAVO adjustable ventilators can be used in almost any situation. Tailored grilles are listed in section SG41. In addition to these standard products, we are happy to help you with specific ventilation issues in areas such as historic buildings or special applications where a standard grid is not applicable.