Safe to use. Lightweight, quick and easy to install. They keep technical and hygienic properties in changing operating conditions. Large temperature range the use of (from -20 °C to + 65 °C) with a . Comfortable all year round and high efficient ventilation. They do not corrode and get aesthetic appearance throughout the entire operating life. Designed and intended for use in the ventilation systems in both the inner and outer of the building, made of high quality material, which is resistant to external factors.